Although what is there is done rather well, I think the water park is a massive missed opportunity for two reasons:- It just isn't big enough and does not have enough to do. It is not worthy of being a destination in itself and not worth missing the theme park for a day to visit (especially considering the price of the hotel for a night, it's not worth adding a further day to your trip for it either). - It is (generally and in my experience) only open when the theme park is. People would pay to go in the evening if it was open but it's not, so they can't. This is dumb.Those slightly more 'mature' members like myself from the South of England might remember an amazing water park near the Dartford river crossing called Fantaseas. It had rapids rides, a launch tower of about 10 flumes, lazy river, wave pool, multiple outdoor pools and loads of other little bits. People came from miles around and it was always insanely busy (unfortunately they built it on a disused rubbish dump, burnt the rubbish away from underneath and it fell down. Idiots). It is the sort of thing that would fit so well into Alton as it is squarely aimed at the thrills and family market. Imagine a flume based on every major Alton ride, could be epic.It feels to me like it was built as an add on perk for the hotel guests to get for free (in fact I think it might have been) which they've now decided to charge for and market as a theme park in the water, which it really is not. I would love to see it really heavily redeveloped as part of the inevitable third hotel plans into some sort of cross between Centre Parcs and Fantaseas, Alton would then really be a multi day stay destination in my eyes.