3.5 actually. Its a great fun for kids, especially for the first time, amazing attraction for the winter period. For adults, there is not much place to relax. It's good for the first experience. Those, who tried European therms or asian aquaparks, would probably be disappointed.... It seams to be overpriced, especially talking into consideration. that all children before 16y, should be accompanied by adults. Adult tickets are substantially more expensive then children's. But as i mentioned before there is not much to do for elder folks 2 hours is the maximum. During my visit there were no long waiting lines for slides. But i can assume that thay cam can be annoyingly long during rush hours. Because they have approximately 1 min intervals for each ride. Is looks clean and safe (oversafe). I would say its rather the tourist attraction, than regular entertainment for locals.