Playparq have a number of venues, Kemang, Bintaro, Epicentrium and I think a couple more planned. They are a small kids play park and Bintaro and Kemang have water play areas also. For a small fee (from 40,000-90,000 IDR) your children can play and have fun on trampolines, flying foxes, water slides, climbing cages, etc.
They have a cafe room and adult seating too, so you can have a rest. It is possible to book them for a kids party.
Do not forget to bring a change of clothes and socks. (everyone must wear them inside)