Tenerife in March with 3 year old and 2 year old - stuff to do?

[TuttiFrutti]

We've just booked a villa in Tenerife in late March, on the west coast (Puerto Santiago).

Has anyone been there, or elsewhere in Tenerife, with young children? What did you do with them? Are there lots of child-friendly activities like water parks, etc?

I know the temperature in late March may not be very hot, so I don't think we'll be lying on the beach!

Nobody?

Our 3 year old loved the water park at Playa de las Americas and they did a free entry on next visit ticket, so we got to go twice. However, I think since we went (2007) a new water park has opened near Los Christianos. We also went to the Loro Parque (which is the island zoo) but it has a killer whale show, dolphin show and seal show, as well as the other animals and she loved that too.