We've been going to this waterpark every easter break. No need to worry about the weather as it is indoors. Tesco clubcard voucher can be used here which is the added bonus. There is a small restaurant inside and the food price is reasonable. Big shower/changing rooms one for ladies, one for men and one for families. Locker rooms for your stuff but don't worry about the coin as the receptionist will remind you or offer change if you don't have one. Plenty of waterslides for all ages. Just an advice. Go as early as you can, preferably as soon as they open, to avoid long queue. That way you can try all the slides without queuing for a long time as it really gets busy especially on school breaks. All in all a good way to spend the day with the kids. My 6-yr old especially likes the "wave" in the big pool.
If you own or manage Sandcastle Waterpark, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.