Hydra, Greece, is a serene island known for its picturesque scenery and rich history. One of the best things to do is to explore the charming harbor. The waterfront is lined with cafes and shops, making it a great place to enjoy a leisurely stroll while admiring the traditional stone architecture.

Another highlight is to visit the historical mansions that showcase the island's maritime heritage. Some of these homes have been converted into museums, offering insights into Hydra's past and the lives of its notable residents. The Church of the Assumption of the Virgin Mary is also worth a visit, featuring beautiful frescoes and a tranquil atmosphere.

For those who appreciate nature, hiking along the coastal trails provides stunning views of the Aegean Sea and surrounding landscape. The paths are well-marked and vary in difficulty, making them accessible for different levels of hikers.

Engaging with the local art scene is another enjoyable aspect of visiting Hydra. The island has long been an inspiration for artists, and you can find numerous galleries showcasing contemporary works alongside traditional crafts.

Dining is an essential part of the Hydra experience. You can enjoy fresh seafood and local Greek cuisine at various tavernas, particularly those with outdoor seating that allows for scenic views of the water.

Lastly, taking a boat trip around the island or to nearby islets can offer a different perspective of Hydra's beauty. It’s a peaceful way to appreciate the surrounding waters and perhaps even go for a swim in secluded coves.

Overall, Hydra offers a blend of culture, history, and natural beauty, making it an ideal destination for those looking to unwind and explore.