Diver Kat
Contributor
I suggest you travel with US currency and convert on arrival. Be sure that all your bills, especially $100s, are of the newer types in good shape, since many banks no longer accept the older US currency, nor torn or marred bills.
You've mentioned the new US bills, but has anyone used any of the new dollar coins in Cozumel? I'm wondering if they'll flip out if I use some there ...