demiurge1138
Inventor of Super-Toast
Let's treat it as a monk of Xth level. X = CR? HD?
For river travel, the Ga-hon-ga use magical canoes which will, at times of need, fly into the air with a single stroke of the paddle (acting as a Carpet of Flying).
The Ga-hon-ga can control fish with the same power as a Trident of Fish Command, and they can Control Weather as a 12th-level druid.