Top 5 Lesser-Known Greek Islands to Explore Far from the Crowds
While islands like Santorini and Mykonos dominate travel guides and social feeds, Greece is home to its fair share of under-the-radar islands that remain blissfully uncrowded. These lesser-known Greek islands offer breathtaking landscapes, authentic local life, and a sense of discovery that the more popular destinations can’t always provide. From ancient ruins to colourful harbour towns and untouched beaches, these hidden gems invite you to explore Greece beyond the obvious.
KeyTours makes it easy to discover them all with expertly curated island cruises that are perfect for travellers seeking authenticity, nature, and meaningful cultural experiences.
Why Explore Lesser-Known Greek Islands?
Choosing to go off the beaten path in Greece comes with a wealth of rewards. First, there’s the quiet—these islands are free from tourist hordes, allowing for a more intimate connection with place and people. Prices tend to be lower, while the hospitality is often warmer, and the pace of life slower.
These lesser-known Greek islands are perfect for travellers seeking authenticity, nature, and meaningful cultural experiences. Many are easily accessible by ferry from Athens or nearby hubs like Mykonos or Rhodes, making them a fantastic alternative to the busy Cyclades, especially during the high season. Whether you’re a solo adventurer, a couple seeking serenity, or simply someone who values depth over spectacle, these islands invite you to experience Greece at its most genuine.
The Top 5 Lesser-Known Greek Islands to Discover This Summer:
Here are our top picks for 5 off-the-grid island destinations that promise unforgettable journeys and memories, each one offering something different, but equally mesmerising in their own way.
Rhenia Island
Photo credit: By Sgroey - Own work, CC BY-SA 4.0 Source
A peaceful neighbour of, and often overshadowed by, the ever-glamorous Mykonos and the sacred island of Delos, Rhenia Island is definitely among the hidden gems of the Aegean. Completely uninhabited and undeveloped, Rhenia offers a glimpse into untouched Cycladic nature. With no permanent residents or infrastructure, it’s the ultimate destination for those seeking solitude, raw beauty, and unspoiled beaches.
In ancient times, Rhenia served as a sacred burial ground for nearby Delos, one of Greece’s most important spiritual centres and the mythical birthplace of Artemis and Apollo. Because Delos was deemed too sacred for human births and deaths, all tombs were moved to Rhenia. Archaeological finds include graves, funerary offerings, and ancient ruins. Today, despite its solemn past, Rhenia’s turquoise waters and quiet coves offer an idyllic setting for swimming, snorkelling, and sunbathing away from the crowds.
Rhenia is accessible only by boat. One of the best ways to visit is with KeyTours’ sunset cruise from Mykonos, which combines expert navigation, a relaxed itinerary, and scenic evening views. This is an ideal experience for couples, nature lovers, and anyone looking to escape the bustle of Mykonos for a few blissful hours.
Anafi Island
Tucked away at the southeastern edge of the Cyclades, Anafi Island remains one of Greece’s best-kept secrets. Known for its spiritual energy and tranquil vibe, the island is perfect for slowing down and reconnecting with nature and the slow-paced local ambiance. Its rugged cliffs, golden beaches, and lack of mass tourism make Anafi an ideal retreat for off-the-grid travellers.
One fact that you should know about Anafi is that it is home to one of the largest monoliths in Europe, Mount Kalamos, second only to Gibraltar. And at its peak, stands a monastery with stunning views that provides a rewarding hike for nature lovers. The island also has some of the clearest night skies in the Aegean, making it a favourite for stargazers.
You can reach Anafi by ferry from Athens (Piraeus) or via Santorini, which lies just 1–2 hours away by sea. The island is ideal for solo travellers, hikers, couples, and artists looking for inspiration in silence and simplicity.
Symi Island
With its pastel neoclassical mansions cascading down the hillside, Symi Island is one of Greece’s most picturesque and quaint destinations. Located near Rhodes, Symi is known for its elegance, relaxed pace, and the charm of its harbour town, Gialos. The island’s unique architecture, colourful facades, and sparkling bay create a postcard-perfect setting without the fuss of mass tourism.
Symi has a long history of sponge diving, and its quaint villages and historic monasteries offer peaceful explorations. For food lovers, the island is also known for its famous Symi shrimp—tiny, flavourful crustaceans found only here. One more highlight is Panormitis Monastery dedicated to the Archangel Michael, which dominates its namesake bay.
The best way to visit Symi is via a day cruise tour from Rhodes, and KeyTours offers an expertly guided excursion that includes catamaran transport, sightseeing, and free time to wander. Compared to going solo, the tour provides peace of mind, curated timing, and fascinating local insight—perfect for travellers who want a worry-free experience.
Ikaria Island
Famed for the long lives of its residents, Ikaria Island is a haven for those seeking balance, wellness, and a return to slower rhythms. The island is one of the world’s five official Blue Zones, where people regularly live past 90 thanks to clean air, nutritious food, and a relaxed lifestyle.
Locals in Ikaria are known for having a very laid-back atmosphere while locals have perfected the art of ignoring the clock - quite literally. Meals happen when people are hungry, naps are sacred, and parties last all night. Your best bet? Visit a taverna before you are actually hungry. One of Ikaria’s biggest draws is the famous Panigiria; they are traditional festivals taking place all over the island that bring locals and visitors together in grand celebrations of music, food, drink and of course dancing.
Ikaria can be reached by ferry from Piraeus or by a short domestic flight from Athens. It’s perfect for travellers interested in slow-living, culture, and authentic island life. Couples, solo wanderers, and adventure seekers alike will find this joyous island a deeply nourishing experience.
Delos Island
A must-see for history lovers, Delos is one of the most important archaeological sites in Greece—and the entire Mediterranean. Declared a UNESCO World Heritage Site, the island is steeped in mythology and was believed to be the birthplace of Apollo and Artemis. According to myth, Leto, a lover of Zeus, was pursued by a jealous Hera, who forbade her from giving birth on “any land under the sun.” In response, Zeus revealed a floating, barren island from the sea—Delos, meaning “the visible” or “the revealed one” in ancient Greek, where Leto could finally deliver her divine twins.
In antiquity, Delos grew into a major religious and commercial centre, drawing pilgrims and merchants from across the Aegean. Today, it stands as a vast open-air museum with temples, houses, marketplaces, and one of the best-preserved theatres of the ancient world. No overnight stays are allowed, preserving its sacred aura.
Delos is best visited from Mykonos via a guided day tour, and KeyTours offers the perfect discovery cruise, complete with transport, expert commentary, and time to explore. A guided trip like this ensures you don't miss key landmarks, and a comfortable, hassle-free alternative to navigating on your own.
FAQs About Lesser-Known Greek Islands
Are these islands good for families with kids?
While many of these lesser-known Greek islands offer peaceful surroundings, not all are ideal for young children. Symi is family-friendly, with calm waterfronts and a colourful harbour that children enjoy. Ikaria is a great choice for active families, especially those with teens who enjoy hiking or cultural festivals.
Delos and Rhenia are best explored via day tours and may not offer the amenities that families with small kids might need. Therefore, make sure you pack all the essentials they require. Anafi, with its quiet charm and rugged terrain, is better suited to couples or solo travellers than toddlers.
Is English spoken on these islands?
Yes, English is widely spoken in tourist-facing businesses such as accommodations, restaurants, and ferry ports. On smaller islands or in more remote villages, locals may speak only basic English, but travellers rarely face communication issues. Learning a few simple Greek phrases can enhance your trip and is always warmly appreciated.
How long should I spend on each island?
Rhenia and Delos are perfect for day tours, especially with a guide who will be able to enrich your visit. Islands like Anafi and Ikaria reward longer stays (3+ nights), allowing time to unwind and embrace the slower pace. Symi can be experienced on a full-day excursion from Rhodes or explored over 1–2 nights for a more immersive feel.