On our trip to Mnemba in the Indian Ocean, we were lucky enough to include a number of dives and a quick dip with a passing dolphin.
I spotted the dolphin off the bow on the way out to a dive site, and as we motored past as he was leaping out of the water. Then it was on with the mask and fins, and slink into the water so as not to disturb him too much. I got a passing photo, but it was simply great to be in the presence of a completely wild dolphin, in its own environment.
The diving was equally superb. Plenty to see, both in terms of interesting fish - including lion fish, box fish, file fish, a cute sweetlips, and a few sting rays - and also pure quantity of brightly coloured fish - eg surgeon fish, Moorish idols, snappers, and fusiliers.
On our first dive, Sue got close to an anemone being protected by some clownfish - and they were coming right up to her mask to chase her away. The same happened to me on the last dive. We were amazed by a few of the flounders we saw - they just vanish into the sand. And we saw a pair of razor wrasse, which shot into the sand at amazing speed as soon as they saw us come close.
Our dive guide was very excited, as we spotted a "snowflake moray", which apparently is sufficiently rare that it's not even in the Indian Ocean book! That picture is going on their website!
My personal favourite find was the Peacock Mantis Shrimp. This guy is really interesting to look at, but he's also got the most forceful punch in the ocean. He can hit so hard with his claws that he will smash aquarium glass if he's kept in captivity!