Darien Lakes State Park's terrain is hilly with woodlands, ravines, streams and 12-acre Harlow Lake. The park has a total of 154 campsites, 141 with electricity and 13 primitive sites without. Also available are heated comfort stations and showers, a beach, playgrounds, fishing, hiking and horseback riding trails, picnic areas and a rustic bridge over the lake channel to Picnic Island. In winter, multiple-use trails are open for hiking, cross-country skiing and snowmobiling.
Household pets, caged or on a leash not more than 6 feet long with a current rabies certificate are permitted. No pets allowed on the beach, day use areas, or park buildings. For campers there is a two-pet maximum.