Thanks for the advice everyone. That should be enough to keep us out of trouble!
Brent, thanks for the Cheeca info. Does that mean no more dive op at Cheeca? I've rarely had good luck with on-resort dive shops anyway. I checked out your website. Your boat looks absolutely perfect for diving. I should have checked on Scubaboard before I booked everything! We're only going to be down for a few days, so if we can't fit in Key Largo on this trip, we will definitely move a bit up the road next time so we can dive with you. How do the private charters work? My wife would really like to go that route. PM me if this isn't the place to talk details.
And beachcomber, I don't think you can beat the upper Keys for diving, beginner to advanced. Of course, I dive quarries in the midwest so what do I know!