Rio Frio Cave isn’t so much of a cave as it is a really neat naturally formed tunnel. It has the largest entrance of any cave in Belize at right around 65ft(20m). Inside it is a quarter mile to the other side, so you are still going to need a flashlight. The cave has giant rocks (giant means larger than two elephants on each others shoulders) and some very nice formations. Rio Frio is very easy to get through and gets a anyone-who-can-walk-can-make-it-through rating.
Before you get to Rio Frio there are some trail markers that will lead you to some other caves if you are in the mood to hike a little more. They are “Tunnel Cave”, “Closed Jaw” and “Twin Caves”. They aren’t really all that exciting, but it’s a nice walk.