Green water and a cliff reflection, calmer than the pillar park. You ride a boat more than you hike. Useful when the high trails are in cloud, and pleasant when they are not.
The boat is quiet by Zhangjiajie standards. That is the recommendation.
Nature, not a trek. Life jackets if they hand you one.
Getting there
A short ride from Wulingyuan. Do it at the end of a park day only if you still have daylight. Otherwise give it a morning of its own when the mountain is socked in.
Staying nearby
Wulingyuan. Walk back to dinner. There is nothing to sleep beside the lake that beats the town.