Zip Lining in Belize

We have been to Belize before and experienced cave tubing, which was wonderful, but now we would like to try zip lining. A friend of mine went a couple of years ago with Carnival and absolutely loved it. He said they were driven about an hour and a half away, great zip lines, and some minor rappelling, and having to stand on skinny boards on the side of a cliff all while tethered of course. I have never booked through Carnival and I don't want to now. They charge way too much and the reviews on Carnival's site are pretty negative in regards to cost, crowding, and attention. My question is....can we go to the same place Carnival goes (it is around Crystal Cave from what I can gather) with another vendor? I find lots of glowing recommendations for zip lining but I am not sure if they are the same zip lines that my friend raved about. Any help or recommendations appreciated!!:D

Tanya