Considering the Sol Costablanca in Benidorm?
A VT member wrote the following comment about visiting Benidorm:
Aqualandia by deeper_blue
Aqualandia is a great getaway for families and groups. Located 2 miles from Benidorm it is a water park with some great water slides and attractions. It costs 19 euros for adults and 12 for children.
Tip for daredevils: Try Kamikaze or Big Bang.