The boat trip into TN takes about 3 hours - best not to drink too much of anything in the couple of hours before you get on the boat as it DON'T MAKE POTTY STOPS.
For men, a wide mouth plastic bottle is very useful.
The ride is bumpy - sit on your life vest.
If you have a 'brolly, keep it to hand.
TN is not as isolated as visitors are led to believe - it is only 50 minutes by car from K. Tembeling. A much more comfortable ride.