Jerry,
Is the diving you're going to be doing later drysuit diving? Do you need a course in using a dry suit if you haven't used one before?
I sure as hell hope it will be. But if the fates won't allow, my wetsuit will be sufficient. The ships are resting upright on the bottom at 100' feet, with the interesting stuff around the deck well above that. No decompression bottom times won't allow us enough time to go hypothermic.
I understand that drysuit courses are recommended. Our local dive shops include an orientation dive with any drysuit purchase, but one of my favorite charter guides offers a two-tank drysuit instruction dive as a PADI specialty course, in case I land one from E-bay.
You can rent a drysuit from the charter we'll use in the San Juans, but I believe they require an orientation dive or specialty cerfication before they rent out the suit. Check out their site, www.divesanjuan.com
Having two gear-intensive hobbies (diving and cycling) pretty well insures I'll be well outfitted for neither.
It looks like our plans for Mexico have disintegrated; Air fares for the family are approaching $3000. We'll look into it again in the spring or summer, I'd love to dive those Cenotes.
I'm looking forward to those Pics,
Steve