I’m planning to stay 7 to 8 days is what I normally do there. The diving is awesome I think there are a couple of statues I’ve seen in the past more are up near Cancun where all the tourist divers go. I would definitely get your AOW, Nitrox has come in handy for me. I was in Malaysia in Nov. and if it wasn’t for switching to nitrox the previous day we could not have dived our last day. It depends on your situation and where your at. I would not get it just because of this trip I don’t use it all the time. I don’t think I’ve been on a boat that didn’t offer it.