The park has great fresh water and salt water resources that are ideal for fishing. The area is home to mussels, oysters, and clams, which can be harvested on a seasonal basis. A state fishing licence is required to fish Big Mission and Little Mission creeks, and a state saltwater licence is required for crab and shellfish harvesting and fishing.
The park has two picnic shelters available on a first come, first served basis. The shelters do not have electrical hookups. Additionally, the park has two sheltered picnic tables and 130 unsheltered picnic tables. The day use area contains ADA restroom facilities and open beach access.
The park’s vicinity to the fine gravel beaches and temperate waters of the Hood Canal park makes it an ideal place for windsurfing, kayaking, snorkeling, and swimming.
Belfair State Park has a vast playing field for sports, with an adjacent play area for children. The field is also open for kite flying.