Extensive selection of diving, snorkeling, and water gear. Staff are very knowledgeable and will either leave you be as you browse two floors of goods or assist you with every last question you have - it's your call. I've followed most of their recommendations and been very pleased with my most recent dive gear purchase. I also love that they carry a small supply of Reef clothing. Even if you don't dive, you'd find a nice array of beach and summer items that range anywhere from inexpensively priced to more expensive, higher-quality supplies. They also offer year-round dive certification classes/trips.
There's an annual May sale that is phenomenal. I appreciated staff giving me a heads up on the sale before I bought some new boots, telling me if I could wait I'd save a bit of cash come May. Turns out I needed them right away so I couldn't - but again, staff proved themselves to be very helpful.