If you like walking, then there is a nice 1hr coastal path walk to Puerto Calero from the Old Town harbour
Jameos Del Agua has to be one of the most beautiful and tranquil places, you have to see it to believe it for yourself. From tiny white crabs in the crystal clear cave lagoon to the spectacular outdoor lagoon pool and in-door theatre.
If it’s excitement you are after then try Go Karting in San Bartolome
Or off-road buggy trip for the day… p.s don’t forget your sun glasses it gets very dusty… you have been warned