Just thought I would let everybody know about another option for cave tubing in Belize. My family went cave tubing this past April with Elite Belize Tours, they are located right in the building where the tenders drop you off. The guide we had Vincent was excellent, he showed us a few of the sites in town before taking us out to Jaguar Paw. The guide at the caves was very friendly, spoke good english and was knowledgeable about the area. The tour included a meal at the resorts restaurant.
The best part of the trip was that we were the only people on the tour. At the time my kids were 9 & 12 and they had absolutely no trouble at all. You can find more info about Elite Belize Tours at www.elitebelize.com
Hope you find this helpful.