Sun Lakes State Park is a 4,027-acre (1,630 ha) camping park with 73,640 feet (22.45 km) of freshwater shoreline at the foot of Dry Falls, which is located near Coulee City, Washington. Formed by the Missoula Floods, Dry Falls is the site of a former waterfall which is now a stark cliff, 400 feet (120 m) high and 3.5 miles (5.6 km) wide. When the floods occurred, the waterfall was ten times the size of Niagara Falls. Today it overlooks a desert oasis filled with lakes and abundant wildlife.
Recreation opportunities include fishing, swimming, boating, hiking, horse rentals, and a golf course. It is a prime example of shrub-steppe habitat. There is an interpretive center on area geology. The park is located in Grant County, Washington along Route 17, at the head of the Lower Grand Coulee.
There is a camp site that contains access to the lake, a swimming pool, and a mini golf course.