The groundsIf you have children this is a must do in Bali. The Waterbom waterpark is a great day's entertainment for all ages. It is very cheap by western standards and if you are in Bali long enough, buy a multi day pass because the extra days are very cheap.
Towels and lockers are available for hire but prices are only dispalyed after you pay entry. There are plenty of pool chairs as well as family gazebos for rent.

It has a huge food area, with every conceivable type of food at realistic prices (unlike most adventure parks).It is very busy at lunch but if you have a gazebo they will deliver your food to you.
Instead of using cash you get a cash-band that has credit on it and straps to your wrist so no need to carry a bag. Any extra credit gets given back to you at the end of the day.
The ticket for two day pass is valid for 7 days after purchase to get entry back into the park, they may not accept prebooked tickets from home, it is usually the same price or less when you get there anyway.
It's good to arrive early (opens 9am-6pm) so you can go on the popular rides before the queues get big. Even when busy though you don't have to wait too long.



Source: tripadvisor.co.uk