If you have never been to Indonesia i can recommend it. I was on Bali and the took a couple of days on Gili T. The water is amazing and there is so many opportunities to go and dive. Here are two of my favorite pictures from under the water.
Here on the first you see these underwater statues.
Here on the second picture i saw this sea turtle. Some of the turtles was almost as big as me.
What is your favorite places to go dive and snorkeling?