It's around 45 minutes each way if you don't play around much.
Beyond the normal things, there is some exposed rebar in the river you could cut yourself on.
River tracing boots, sunscreen (you will be exposed to the sun for a fair bit of the trace)
A short fairly easy river trace located within an hour of Taipei. The river and surrounding rocks contain tons of pretty colors. In the end, you will be rewarded with a beautiful waterfall sitting behind a perfect swimming pool. Great place for people without much experience to get a taste of river tracing. The first half of the trace is enjoyable though nothing special. The second half has some great views of the surrounding mountains and feels much more "natural". When you park you can either jump over the fence and find a way into the river on the other side, or you can cross the highway and enter from where the river meets the ocean. It is possible to climb past the waterfall I ended at. It would take some decent climbing skills though and falling would suck so a helmet wouldn't hurt.