The Maldives is known to have some of the best diving sites in the world, and we took advantage of this in 3 dives.  The most exciting thing for us was a night dive that we did, plunging into the water while it's completely dark outside.  We saw totally different sea-life in the nighttime, and of course had high powered lights to illuminate the reefs.  We also snorkeled every single day along the reefs.