Grand Isle is in a great location. Close to Seaside. Close to an access. Not hard to cross 30A there. Flip-Flops and Seagrove Coyote/La Botana serve very good food. If you have a choice, choose the western side over the eastern side. The pool is on the eastern side, and you know how sound broadcasts from a pool. That being said, as often as we go to Grand Isle to eat, there's rarely anyone in the pool. The building blocks the sun for a lot of the day, so that's not good for people trying to get a tan.
If I were thinking about buying there and interested in tanning, I'd check out the sun availabilty at the pool. Owners there, please chime in with your experiences of that.