In the heart of the Aegean and Mediterranean Seas, some Greek islands are forging a sustainable path that combines local traditions and practical ecology. More and more island destinations are committing to more environmentally friendly tourism: renewable energy, soft mobility, short supply chains, zero plastic…
Far from the crowds and mass tourism, these green islands offer another way of traveling: slower, more humane, and more conscious.
In this article, we take you on a journey to discover five Greek islands that are exemplary in terms of ecotourism, and the local businesses that are committed to preserving these natural gems while offering travelers authentic experiences.
1. Alonissos – A Preserved Marine Sanctuary
Located in the Northern Sporades, Alonissos is home to the Alonissos and Northern Sporades National Marine Park, the largest protected marine park in Europe. This park is a refuge for the Mediterranean monk seal (Monachus monachus) and many other marine species. The island is renowned for its conservation and ecotourism efforts.
. Ecotourism activites: guided hikes, eco-friendly scuba diving, and marine wildlife observation.
.Committed businesses:
- Alonissos Dive Escapes offers diving experiences focused on marine conservation and community engagement.
- IKION ECO Boutique Hotel offers eco-friendly accommodation, adhering to strict standards to ensure a non-toxic and energy-efficient environment.

2. Hydra – The Car-Free Island
Just two hours from Athens, Hydra is unique: it’s car-free. Travel is done on foot or by mule, preserving the island’s peaceful atmosphere. Hydra is also known for its preserved architecture and commitment to sustainable tourism.
• Ecotourism activities: hiking along coastal paths, cultural visits, exploring local crafts.
• Responsible companies:
- Hydra Tours Travel offers sea excursions with environmentally friendly boats.
- Hydra 4 You offers activities and tours highlighting the island’s natural and cultural heritage.

3. Zakynthos – Sea Turtle Conservation
Zakynthos, in the Ionian Islands, is famous for its fine sandy beaches and turquoise waters. The island is also home to the Zakynthos National Marine Park, created to protect the endangered loggerhead sea turtle (Caretta caretta).
• Ecotourism activities: turtle watching, hiking in protected areas, and participation in conservation programs.
• Responsible businesses:
- EcoZante offers ecotourism activities such as kayaking, diving, and hiking, with a focus on sustainability.
- Eco Zakynthos brings together organic farms and local businesses promoting traditions and

4. Kalymnos – A Paradise for Climbers and Nature
Kalymnos, in the Dodecanese, is renowned for its spectacular cliffs, making it a popular destination for climbers from around the world. Beyond climbing, the island offers rich biodiversity and ecotourism initiatives.
• Ecotourism activities: rock climbing, hiking, scuba diving, exploring local flora and fauna.
• Committed companies:
- Kalymnos Travel Group offers tourism services focused on sustainability and respect for the environment.
- Eco Living Greece aims to make eco-friendly products more accessible, thus encouraging sustainable practices.

5. Kea (Tzia) – The Island of Ancient Trails
Located in the Cyclades, Kea is known for its ancient trails that traverse diverse landscapes, from lush green hills to secluded beaches. The island encourages slow, environmentally friendly tourism.
• Ecotourism activities: hikes along historic trails, discovering traditional villages, and participating in artisan workshops.
• Responsible businesses:
- Kea Village offers eco-friendly accommodations and organizes activities such as diving, hiking, and sailing.
- Kea Terra Active offers e-bike tours and hikes to discover the island’s natural landscapes.

