I travel alot, and when I have a chance to visit an aquarium in a foreign country I usually make the effort. The aquarium in Okinawa, Japan was pretty impressive. I don't think you can see them but there are a few sharks in the tank below, and a little alcove where you could sit and feel like you were in the water. Amazing.
Main Aquarium, Okinawa, Japan
Does this give you some ideas? Inspire you to create? Let me know~