A serious water park on Jalan Kartika Plaza, set in three hectares of tropical garden with a couple of dozen slides ranging from gentle family flumes to near-vertical drops that feel longer than they look from the queue. Long-running rankings have repeatedly placed it among the best water parks in Asia, and unlike a lot of Bali attractions it is genuinely well maintained — lockers, lifeguards, and proper food and drink instead of the usual tourist mark-up.
A full day costs roughly the same as a budget hotel night, which is steep by Indonesian standards but a fair deal if you have children with you. Go on a weekday to avoid the local-school crowds, and arrive early — the queues for the headline slides like Climax and Smashdown stretch fast after lunch.