We were in SP for Xmas week, and had a fantastic time at Sunbreeze.
About 10 days after our return, my son Chip's feet started to itch like crazy...at which point I remembered and reviewed the previous discussion thread about cutaneous larva migrans.
Chip did not have the "tracks" usually associated with this li'l pest --just a distinct little bump on the sole of each foot. Our pediatrician dismissed my suggestion that it was probably "ancylostoma duodenale" or "nector americanus" (better known to his friends as "hookworm"), but guess what? I took two $100 consults to get to a third $150 consult to learn --yes, you guessed it: the Ambergris Caye Message Board had provided the final answer FIRST.
It's pretty easy to treat, so don't worry. Just wear shoes and sandals when you can down there. And if you do get that sever itch: tell you doc what it is and if he/she disagrees, bet 'em their fee!! You might save the $350 I had to spend.
To see the whole earlier thread, search for "migrans".