Any good SCUBA shop should have lots of cool masks, snorkels, and fins to choose from.
And a very good SCUBA shop should also have lots of different types of tanks and BCs available, as well as convenient equipment rentals.
An exceptional SCUBA shop would have its own salt water pool where you could test equipment, receive training, and fine tune your buoyancy before your next big trip.
But the best SCUBA shop has knowledgeable staff with years of real diving experience and a love of SCUBA diving. Folks that can give you straight and honest advice on what will be the best equipment for you and the kind of diving you do.