I was there for the day a few years ago. Climbed up a mountain and fell on my ass in the mud! It was fun though...
But if your primary interest in going there is to actually see a jaguar in the wild, my advice is to spend a couple of days at Chan Chich, which has more jaguar sightings than anyplace in Belize. I was there for three days this week...didn't see a jaguar, darn it! But a couple of other guests did...and the employees see them often. We did see howler monkeys, spider monkeys, foxes, deer, a large troop of coatamundis, all kinds of birds and I even saw a jaguarundi (a small funny looking cat that doesn't really look a whole lot like a cat but is one....) It's a gorgeous place, expensive but worth it.
For info go to
www.chanchich.com