Grand Lake St Marys State Park offers eight state-operated boat launch ramps providing access to the 13,500-acre lake with 52 miles of shoreline, featuring a 300-foot no-wake zone enforced around the lake.

The park includes an accessible fishing pier at East Bank, accessible fishing access at West Bank, seasonal dock rentals (April-October), a full campground with amenities, and multiple picnic areas on a first-come, first-served basis.

Additional features include paved multi-use trails, swimming beaches, and a nature center, with the park open 6am to 11pm daily.