Good morning!
I plan on taking a full cave training in Mexico next year (I'm Adv. Nitrox now with 300+ dives). March/April most likely. I will spend at least two weeks there. I have a few questions before I start organizing. I hope for some quality recommendations from you guys
I highly recommend Under the Jungle.
Nat and Vince, the co-owners, are both truly excellent cave instructors and the whole shop has a fantastic culture. The shop is near the entrance to the Tajma Ha cenote, which is very convenient for training. (Taj is a popular training cave) You can stay nearby in Puerto Aventuras, which is a large mixed-use community with condos, B&Bs, restaurants, etc. By next year Nat will have some rooms for rent in Puerto specifically for people training and/or diving with the shop.
I can tell you that 2 weeks is not enough time to complete full cave training if you have never done any technical diving, or are used to diving with manifolded doubles or sidemount. If an instructor tells you otherwise, I would be a bit skeptical.
Basically, if you are currently a single tank open water diver, even an excellent one, you would have to take cavern, intro to cave, and full cave, and in addition to that (prior to any cave training) demonstrate excellent control of buoyancy, trim, propulsion, and simple task loading in doubles or sidemount. If you are not already very good with doubles, I would suggest just moving straight into sidemount training before taking any cave classes. That's because sidemount is overall a better system for the caves in Mexico and probably 80% or more of experienced cave divers there use sidemount. It has to do with the geology of the caves there and it's also much nicer for entry-exit from the cenotes. If you are already good with BM doubles you can use those for the classes, (that's what I did) but keep in mind that most people (myself included) end up diving sidemount down there sooner or later.
The best way to approach this type of training is to go slowly, making sure that you develop the best possible habits and skills, and then add on the more complex things after some good experience in the simpler environments. In two weeks, you might be able to get a good sidemount course done (there's a lot to learn if you want to do it well) and cavern, then maybe start intro to cave. Or if you wanted to skip the SM, you could spend fewer days getting trained in BM doubles and maybe have time to do more in intro. Either way would allow you to do some training dives with an instructor on the mainlines to 1/6 penetration. You can get to some very nice places in Mexico that way and you could begin to internalize the various skills and awareness you need to become an excellent cave diver. It's a lengthy learning process that requires quite a bit of repetitive practice.
Anyhow, send Nat an email and ask her about it, I suspect she will give you all sorts of helpful information.