Awesome....
AC Boy:Yup, right here at Underwater World! If my memory serves me well, I paid about USD75 each for an hour-long session in the tank. Gear's all provided for... well, almost - just gotta bring your mask.
The session started off with some playtime with Gracie (prob abt 15-20 min), and then it was off to the sharks and rays in another part of the aquarium.
If you're interested, you can find out more here