We took the cave/river tubing tour offered through Xtreme Tours in Belize and had a wonderful time! Our guides, Richard and Manuel, were very informative the entire trip and helpful with any questions we had. My boyfriend and I booked this tour after reading several good reviews of Xtreme through this website. We were in an air-conditioned van for the ride to and from the river, which was nice in the Belizean heat. Once at the river, you get your tube to carry, and the jungle hike took about 30-40 minutes I guess, and wasn't too difficult at all if you're in mediocre to great shape. The guides point out several local floral and fauna and tell you about them. Once at the cave entrance, you can either walk down to the water and get into your tube easily, or you can jump about 10 feet off a rocky cliff into the river and they throw your tube down to you. I chose to jump - it was a blast! Plus, the water is chilly and just jumping in is an easy way to get used to the temp. Once your group is in the water, on their tubes and has their headlights on their heads, you start floating through several caves, looking at formations and bats pointed out by the guides, maneuvering through some small rapids (not bad at all, though), and just paddling backwards leisurely and enjoying the float. I'd say about 75% of the trip is inside the caves, and the rest (at the end) is in the sun, which is nice because you get a little chilly after awhile in the caves! Then, you can eat a delicious Belizean lunch there for $5 which was wonderful. Afterwards, your guides drive you back to the port, where you have time to shop a bit before returning to your ship by a tender boat. I would recommend this tour to anyone and I know we had more fun using Xtreme than the ship's tour because we had less people in our group and got to see an extra cave!