This is a local religuous festivity in which people from different villages come together and sing and danse for houres.
Three old craters of which one is now a sulphuric lake and the two others are immurged in the sea to form Moya Beach
Within 20m from the beach you swim with giant sea turtles and ad another 20m and you swim inside a tropical aquarium.
On the island you can do everything by foot. There is a very good book for sale in the capital bookshops with a description and maps of all the hiking trails.