At Art’s Riverview Jungle Lodge, there are inner tubes available to rent. This activity wasn’t included in our Intrepid trip, so we had to pay extra. The cost was 200 baht each, about $5, and we were gone for about 2.5 hours total. We had two guides with us and we were provided tubes and transportation back to the lodge at the end of the day.
Our starting point was the lodge (which was on the river), so we all hopped on a tube and started floating. The water was a little low, so occassionally our guide would yell "Up Your Bum!" It was so hilarious! We figured out that they meant we should lift up our behinds so we wouldn’t hit them on the river rocks, but we still cracked up every time we heard "Up Your Bum! Up Your Bum!"
We ended our tubing trip also in the middle of nowhere. We waited for a little while for our ride and headed back. They dropped us off at a bridge over the river that was above Art’s (maybe a 20 minute walk from Art’s) and we tubed back to the lodge.