We visited the waterfall before going to the hot spring park for the Japanese bathhouse (read my review on that there).
We parked at the scenic view area (NT50 per vehicle) and walked about a mile to get to the waterfall. If you can get someone to drop you off by the vendor area (past the parking area), then the walk is even shorter. Once you are inside the waterfall area, it is all steps and the trail is well maintained. Level 1 waterfall area was closed when we went so we took pictures by level 2 area. It is quiet small so I can seeing it being crowded when visiting on a weekend or holiday.More