The park consists of two parts--indoor and outdoor.
Indoor contains: tubes, whitewater stream, big pool, children's pool.
Outdoors: half-pipe water slides, pool
Saunas (Turkish and Finnish) also available.
I personally would recommend coming there at 16.00 to buy a reduced price ticket. 4 hours will be enough to see and try all the fun and not to get bored.
The bus 339T leaves from Kamppi (central Bus Station) every 1.5 hours. But be sure to check the timetables first.
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