Hiking 

The routes down to the town or even across the house line above Hydra and Kamini heading west to Vlychos is very easy, interesting, and wonderfully picturesque. There are also organized walking tours to longer hikes to the monasteries of the island located on the hills

Swimming

There are many beaches for swimming all along the coast of Hydra. Close ones are just a few minutes from the house. Some of the more secluded ones can only be reached by boat. 

Horse riding tours

Harriets Horses or Argiris horses provide tours around the island. 

Scuba diving excursion

The PADI school in the port of hydra offers fun dive excursions around the island waters. 

SUP Yoga

With a large enough group it’s also possible to organize a boat trip and SUP yoga half-day excursion. 

Eat and Drink

There are many great tavernas to choose from to enjoy traditional Greek food as well as Italian and mixed European restaurants. And in the port, there are a number of bars for evening cocktails and drinks.

You can find lots more fun information about Hydra here:
https://www.hydradirect.com