>>2218572If you just got your cert I would just try to dive a bit and get some experience and dives in. You need to be very comfortable underwater, have decent trim, and be able to negotiate task loading. All that said, if you want to try it though you can get a guide to take you into the cavern zone (which is basically a cave) at any time. Pretty much any dive shop in and around akumal will do that.
For cave diving you will need to learn technical skills so helicopter turns, frog kick, back kick, clipping stuff on and off, valve drills, s drills...that kind of thing. It really helps if you have those as muscle memory so you don't get mind fucked once navigation is introduced.