Highlights
The park follows Cox's River between Lake Wallace and Lake Lyell, with deep waterholes and shady trees. The peaks in the park reach almost 1200m above sea level where snow gums may be seen. The park is the home of the purple copperwing butterfly that can be seen in the spring.

Activities
Camp along the banks of the Cox's River in one of the many small campsites such as Marrangaroo campground. Enjoy swimming or relaxing while platypus spotting on the river banks. Explore Lake Lyell by canoe, or, after rain, run the rapids down the Cox's River. One of the best ways to see the park is on a mountain bike. Walk to the top of Mount Walker and enjoy the 360 degree views of the Lithgow area. Fishing is possible along the banks of the Cox’s River.  Flat-water canoeing in Lake Lyell is possible at all times but white-water kayaking along the Cox’s River is only possible after recent heavy rain.