Siam Water Park is a 30-minute drive from Bangkok, in a suburb of Minburi. It features an extensive man-made sea with artificial surf, whirlpools, fountains and waterfalls, and towering water slides amid landscaped gardens. Other attractions include children’s playgrounds, aviaries, an open zoo, and botanical gardens. The park is open from 10:00am to 6:00 pm on weekdays and 9:00am to 7:00 pm on weekends.
Just been to Siam Park in Bangkok. After a 45 min taxi ride from Sukhumvit (about 200bht) we arrived at the park. It costs 200bht for adults and 100bht for kids for access into the park. Once in we found most of the amusement park closed due to major refurbishments going on. The water park is open though which has a few slides and a big wave pool, there are lots of things for kids to do and plenty of lifeguards stationed around. The water is clean but it does get busy at weekends and school hols. Once in the park you still have to pay for certain things like sun loungers and amusement rides but it wont break the bank (10-50 baht).