Just a bit of advice, you may want to contact the dive shop at Ginnie and ask them if Labor Day Weekend is anything like Memorial Day Weekend. There’s literally 15,000 drunk kids that camp there over that weekend. It’s mayhem. We went there a couple of years ago and the people in the dive shop told us we were nuts for trying to dive there. It was crazy! Blue Grotto on the other hand was dead. It was great. We were the only divers there.