Siam Ocean World, Bangkok is located at the basement of Siam Paragon Mall. It's a famous day trip tourist attraction. Very convenient and comfortable to visit. Entrance fee is BHT750 for adults. The fee already includes the 4D Theatre and a Glass Bottom Boat Ride.
For BHT5,000 more, you can even go swimming with the fishes :-)
A must-see when you're in Bangkok. I will definitely go back here.