Palau  
 

It does not get any better than this. It involves mostly wall diving, often strong currents, prolific fish life including multiple sharks on each dive. We stayed at the Palau Pacific Hotel which was a five star hotel with a Holiday Inn kitchen. I would not choose to dive with the house dive school, but would instead use one of the independent operators. Some of my favorite photos are here.

School of Barracuda Batfish Tomato Clown
Coral Grouper Blue Starfish Two Sharks
Turtle with friends Lionfish Tomato Clown
Peacock Grouper Butterfly Fish Tridacne Clam