Located in Central Bangkok the Siam Ocean World is a must while visiting in Thailand or in Bangkok. Located close to the well-known Siam Paragon and Central World it is easy to find. The BTS Siam Station is located close to it as well and if you take the BTS map with you they normally give you a discount. There are other attractions in the area as well such as Siam Discovery as well as Madame Tussauds.
Siam Ocean World is a well known aquarium in Bangkok and ideal for a family visit. The cost is also within reason being an adult ticket THB 990, children 3-12 THB 790. Get 25% off using the BTS map. Being part of a larger global group this aquarium is one of the best you will have seen and definitely the best in Thailand.