Spent a most enjoyable hour snorkeling the reef around Mnemba and also swimming with a pod of dolphins. The dolphins were actually mostly about 15 feet below us in the water, though I watched 2 ascend, spiraling to the surface. I was happy that they could escape the 15 to 20 people in the water when they wanted. The water was comfortable temperature, the reef and fish were lovely, though not as varied and colorful as I've experienced in Fiji. Still, it was a lovely way to spend a morning. Wear waterproof sunblock and a t-shirt over your swimsuit, this is only about 6 degrees south of the equator and the sun is quite fierce - you can burn quickly!