Our tour guide was Flowers and our driver was Enrika.
I can see why this is so popular - it was a great experience. You will have to carry your gear to the river but you are not hurried. My wife, who is not athletic, had no problem. We absolutely loved the river ride and I will never ever forget this cave experience. The cave actually went on longer than I had expected.
There was a line for the lunch buffet but it was worth the wait.
I highly recommend this excursion.
The van was very clean and its air conditioning worked great.
We stopped at the Launa Maya resort after the cruise. We had a great lunch (with drinks included) and we went kayaking in the afternoon. This place was new, very very clean and has private changing rooms. I could have spent an entire day their relaxing, kayaking, swimming and napping. No large crowds - an intimate experience. The owner was there and he made himself available to us for questions or comments.
This tour would have been much more enjoyable if we could have started on time which was no fault of the tour guides but the cruise line.