Thanks to you both for the advice. Looks like driving is the best way. I had previously into MID flights; they're way more expensive than CUN, and AA isn't showing any miles availability. Any ideas on budget hotels? I know this is FT and not LP Thorntree, but I'm more into basic clean and safe 2-3* than SPGs.
Also, any more ideas on how to break up 5 nights and a specific itinerary?