Baiyun Mountain is Lishui's easiest green escape, a large hill park on the northern edge of the city with paved paths, pavilions, forest, and views back over the urban basin. It is more local exercise ground than wilderness, which is part of its charm.
Come in the morning, when residents are walking, drinking tea, and using the paths before the day heats up. It is a good low-pressure way to see how close the hills sit to the city.