We will be first timers to AC in Nov. We are interested in taking a cave tubing/ruins tour, without the trip to the zoo. Do you know if any tour operators will do that? My other question concerns my 13 and 9 year old daughters. They are NOT adventurous, and I'm concerned about their ability to ride the tubes...how fast is the water flow? how dark are the caves? Would my 9 year old be able to ride with an adult, or must she ride alone? Do you just ride with the flow, or do you have to navigate your tube through areas? If these questions can be answered, it will help us in deciding if we all will be taking this adventure, or if we should leave the apprehensive kids at the hotel with their grandma! (And save us a bundle of $$!) Thanks.