The largest state owned fish hatchery in Ohio is located along the East bank of Grand Lake St. Marys. While fishing is not permitted, tours of the facilities are available. Water Skiing - Grand Lake St. Marys has several areas zoned for use by water skiers. Water skiing has a large following in the area, and the lake attracts many water skiers holding state, regional, and national skiing titles. Several marinas are located around the lake, which offer boats, motors, and accessories.
Some marinas also offer rentals.
Both public and private dock facilities are available. Swimming - Supervised beaches and swimming areas are located in the State Park on the West edge of the City. Other swimming areas may be found at various locations around the lake. These beaches and swimming areas attract many sun bathers and swimmers during the warm summer days. Camping - A State Camping area is located two miles West of the City on SR 703.