Belize
Just got back from there in a Merlin 3C.
I used Universal to plan the trip from Merida, MX and back to Monterrey, MX.
The handler they used in Belize was Mr. Rudy.....He IS the MAN at that airport.
If you want his phone number, reply to this, then PM me.
If you will be there for a few days, take a C-208 ($54) to one of the islands and get a room there. The taxi ride to the water taxi is $25 and the water taxi to the islands is $10, so for just a liitle more you get on a Caravan right next to where you will park your A/C. (18 min vs 1:45, taxi/water taxi)
In Belize City, I stayed one night at the Raddison (it sucked) and one night at the Palace Casino(better, but still sucked). I went to Caye Coker(Caulker) and could have gotten a room for 90/night, but opted for a 140/night room. it was New years eve and every thing was full.
Everyone spoke English and were very friendly.
As I said Mr. Rudy Coye with Aero Dispatch is THE MAN at MZBZ. Nothing, I mean nothing, even AA and Continentall moves with out Mr. Rudy.
If your boss wants you to fly to one of the islands, it is possible, but Mr. Rudy will have to get you permission. But you must first land at MZBZ then upon departure, come back to MZBZ to begin your international trip.
Universal charged us about $1000. You might try Colt also.