Like a sunken galleon lying on a sunlit reef, South Florida is overrun with divers. Dive shops, too. Around these parts you'll find dive shops in all shapes and sizes, from storefront mom-and-pops to national chain outlets. For our money the best of the bunch is Divers Unlimited. Not only does the store carry one of the largest inventories of snorkeling and diving gear, it also has a full-time licensed technician on staff who works out of an in-store repair shop complete with its own hydrostatic machine (for pressure-testing tanks). The store also offers a new-diver training center complete with its own practice pool. The pool is even heated; unfortunately it has no sunken galleon.