The water park is rather small. Visited it once only, as it wasn't interesting for my kids. When I was there (maybe is weekday), not alot of visitors so no need to fight for float.
The Jump Street is quite fun for kids, been there many times. There is an "ice"-skating ring next to jump street, but the skating ring is not really ice, but acrylic/plastic flooring. Not easy to skate, compared to the real ice skating. If you really want to "ice" skate, no need wear too thick, as the air-con is not really strong.
Drift in Austin is also quite fun for my kid. Is a small go-kart but can't drive really fast.
There is also a suspended obstacle course. Looks fun but yet to play. Maybe will try that when my kid is tall enough.
After hours of fun, can go to the nearby restaurants to have dinner. Lots of nice food there.