Lake Wilderness is the largest lake in Maple Valley, Washington, United States. The Lake Wilderness Lodge, a former resort hotel, is now a King County landmark, and its grounds are a park. Lake Wilderness is surrounded by houses, forest, and a park. The park is open and free of charge, containing a play ground and baseball field, including a tennis court, also. Every year on Maple Valley Days in June, celebrations are held in the park and the parking lot is occupied by temporary carnival rides.