Don't know too much about the mainland, had some friends do the Mayan trip thing last year and said they liked it very much.
I'm not into tours and the tourista thing as they are. My idea for a tropical vacation is a small sand island, a few grass huts, and a reef to dive in. I have been giving the resorts on Glovers a good look lately.
You thinking of moving down there due to you developing your land in Texas as a toxic waste dump?