We did 4 nights at Caves branch, and it was a highlight of our Belize trip.
The rooms have a ceiling fan, but no power outlets.
Up at the kitchen and eating area, they have tons of outlets powering christmas lights and other devices. During meal time, they had no problems with us recharging digital cameras batteries.
I'd pass on their River Caves tubing adventures, unless paddling up stream into the current while sitting on a inner-tube sounds fun, but I highly recommend the Waterfall Caving tour. My wife and I did it no problems, and they make it sound more intense than it is........but don't get me wrong, climbing a 20 foot high waterfall with water pouring over you isn't a walk in the park either.