My wife and I arrive at AC on December 18 and we stay till Dec. 29th. I have been taking notes and enjoying the exchange at this site for over a month. We are staying at the Blue Tang Inn and plan an overnight to Tikal along with lot's of snorkeling. Is snorkeling conjested at Shark Ray Alley and the other popular sites? I would rather get away from crowds and it sounds like we are heading to the right spot. What's it like in Flores and at Tikal? Spots not to miss at the north end ? I look forward to your suggestions and to some liad back time.