I know it is the other side of the island but a MUST DO is a visit to Loro Park. The translated name of parrot park may suggest its naff but believe me it isn't.
Its worth the entrance fee for the penguins alone.
Have a good holiday. We,ve been in March and the weather was fantastic.
loro park is brilliant and a lovely day out. also if you like walking take the walk from one end of los cristianos to la calata all along the front stopping for a beer on the way of course, there is also a brill spa in torviscas alto its not too expensive and its a lovely relaxing day its called aqua spa