Roughly 4 hours round trip if you start from the GPS above and use the trail out on the way back for as far as possible
Really easy trace, the only thing worth noting is there were a ton of those large black spiders with a yellow mark on their body hanging out on it. Not dangers per say but...
Nothing beyond the usual boots and a lifejacket if you can't swim.
This is a really really easy trace as far as there not being any real difficult climbs or such along the way. I would recommend this place to beginners as it's easy to access and you shouldn't have any issues with it. It is one of the more accessible outdoor adventures in Taiwan. As it's not too far away from society I wouldn't drink the water. At certain points, you may find people BBQing. There are a few places where the water is deep enough to swim if you want. As such if you can't swim be prepared to deal with them. There is also a point further upstream you can start this trace if you want it to take a little longer located at 25.205517,121.520577. Personally, I liked the second half of the trace more but that's up to you.