ByWarren make some very good points. We have a number of excellent physicians on the island. The PolyClinic does not have the facilites for surgical procedures. That is a somewhat complicated undertaking. First of all the funding needed to equip and maintain such a facility, is simply not available. Post Op care , follow up for complications etc. At present there is no full time anesthiologist. (One is on the island, but has not been able to obtain the necessary liscense.) San Pedro does have a fairly large Spanish speaking population and fluency in Spanish is certainly an advantage if not mandatory.
Belize-N-Us, you may want to consider volunteering on a medical project. There are many such groups offering their services through out the country.