You should learn a few minutes worth of information about the Florida Keys Marine Park. If you are not going to be operating in a boat, then just prepare to enjoy the water...its the best here. Be safe in the sun and water, do things in pairs, keep to shallow water, and wear shoes or wet-wearables at all times. The water is neat all over the islands.
All you need to know are the key highlights when boating. Pay very close attention to the signs and try to follow other boaters in and out of the passes the first time through. Tavernier Creek is the lower cut and on the upper end is Adams Cut.
There is one thing you have to have and it is not a scuba air tank, rather a flag to warn boaters. Scuba dive flags on floats must be 12 inches by 12 inches or larger. Divers have to stay within 300 feet the flag on open waters. Boaters approaching divers-down flags have to go to idle speed when nearing the divers.
102601 Overseas Highway
Key Largo FL 33037