Gran Canaria is one of the most visited destinations in Europe, but far too many leave their dive gear at home! You should definitely bring it, because the island offers great diving with huge schools of fish, angelsharks, stingrays and great volcanic seascapes.
Most divers, and especially underwater photographers, seem to think it is necessary to fly halfway around the globe to get a good dive or some great underwater images. Not so! Great diving is much closer to home, at least if you are based in Europe, or plan a stop-over in Madrid.