Congtats,,,since its SO soon,try googling each port
to find agents,,then check each of their sites,references,,etc..Do NOT pay ahead of time.
That being said,,,do plan on SOME excursion in Belize,,not a safe city (IMHO) to wander on own.We did zip line,airboat,,and DH did cave tubing. I m afraid of dark places and after looking at you tube of it...passed..
Cozumel,,can always go to beach on own,,many taxis at dock,,just pick one from tourism site that appeals to you..My DH went snorkeling and I took bus tour of island too(part of cruise excursion)
Sorry, haven t been to others,,but DO HAVE A GREAT TIME>>