From my experience, I have been to Mexico beaches many of them, wide white sand and heavy surf, SP has narrower beaches in most places and some water grass with smooth water, Plancencia, and I have been there several times also, has very remote and sometimes beautiful beaches with wide white/gold sand, heavy surf and sometimes placid. So don't count Belize out unless you are looking for the crowds and action of Cancun. If you are realy into beautiful beaches check out Belize, and No I am not a travel agent and do not own property in Belize.

KBG