We've done the dive at the Fort Pickens several times. Viz is dependent on the tides and there can be lots of fisherman at times. The actual jetties are quite short but there can be a good dive up the channel from the jetties too. There are fish attractors sunk along the slope to the ship channel. We've seen octopus there as well as good variety of fish. The only guitar fish I've ever seen was there. It's not Bonaire but it's well worth doing.