Dongyan Shan National Forest Recreation Area is one of Taoyuan's strongest nature escapes, with cool forest, well-marked trails, and mountain air within reach of the metro-area cities. The landscape is greener and quieter than the lowland districts most visitors see.
The main reason to come is hiking: paths pass through planted forest, native vegetation, and viewpoints that show the folds of northern Taiwan's hills. It is best treated as a half-day or full-day outing rather than a quick urban park stop.