Scuba is great and there are many places to enjoy it but I havent travelled that much but I perfer our coast to Mauritius..

What is your favourite spot to dive and sights to see while blowing bubbles underwater?

So far my best dive site has been Planacar Reef in Cozumel, the vis is amazing, usually in excess of 30 m(100 ft), you can dress light 3-2 shortie or less, and the colours and marine life is amazing. Also because the dives are drift dives you need very little exertion usually resulting in long dives and less air consumption. But Cozumel in general has always been great diving reasonably cheap.
Hope this helps.