Fisrtly, DO NOT pay more than 100,000 dong to get there in a taxi from the Old Quarter. A metered taxi will not cost more than that so don't let a non-metered ride rip you off.
Once you've got your tickets (1 adult, 1 child cost me 195,000dong) go throught to the park, you then have to pay 80,000 for a locker, but you get back 50,000 when you return your key. Your key and ticket will be given to you with a plastic tube you put around your neck while you swim; its not completely water tight so maybe check it every few hours for water.
The park itself it big, it has about 3 different 'play' areas for kids with their own slides and pools, plus a big wave pool which you can go in in a ring or just bob about in the shallow end.
There's an 'adventure' area with zip wires that just propel you into the water and, if you think you're strong enough, a monkey bar type crossing, that normally has a crowd of teen boys all attempting to get across. (I did not even attempt it!)
There's also a reasonably high diving board behind there.
There is then a big lazy river, with hoops, which are really too big to sit comfortably in but i guess for 6-15 years olds it's ok...not really for adults :p but the actual river is great fun, with some really fast bits and the bottom of the pool is fairly smooth so you can slide around it comfortably.
In the middle of the lazy river are the slides; theres a big 5-lane slides, then various tubes (apparently the black is the scariest) and one that you go down in two's in a big double hoop boat.
I didn't go on them as I couldn't leave my little one and she was too small to go on them all/too scared!
Changing rooms aren't all that and there's no privacy, but too be honest, you're all women, you all have the same bits and no-one cares what you look like when you're getting changed. It's a different kind of culture remember!
Ladies; don't forget to bring a top to swim in if you have a bikini, because you won't see many female bare bodies there, as they all cover stuff up, so be polite as do the same!
Not so much with small kids and men don't have to worry.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.