I went with the other site 2 times ago, right smack in the middle of Hurricane Dotty. It missed the coast, but brought in the high tides and sargassam seaweed. The swimming sucked (and sucked you under) but the collection was pretty good because of all the weeds. Many, many SH's, pipefish, anglers and all the Sargent Majors you could want.
Went just with the family last year, water was clear, swimming was great, collection was not in my agenda. But my daughter LOVES Port A, so I might try to talk the family back into it. Only problem is what to do with the 1 month old (she will be at that time) and it also happens to be my mother's birthday.
With regards to where to stay and such, the Mariner Inn and suites has always given pretty good rates to the MAAST group, and that is also where I chose to stay last year. Nice place...not too nice for coming in all sandy. Close to the jetty (not walking but short drive), close to restaurants, pool, and free eats in the morning. They also have a meeting room if anyone wants to turn this into an education meeting type event.