Hartwick Pines State Park is a 9,762-acre park located in the state of Michigan. It is considered one of the largest state parks in the Lower Peninsula and is known for its old-growth forests, hiking trails, and a museum dedicated to the history of the lumber industry.

One of the main reasons to visit Hartwick Pines State Park is to experience the beauty of its old-growth forest. The park has over 49 acres of towering pine trees that are up to 400 years old. Visitors can hike the various trails that wind through the forest, including the Aspen Trail, Old Growth Trail, and the Chapel Trail.

Another popular attraction is the Michigan Forest Visitor Center, which houses a museum dedicated to the history of the lumber industry in Michigan. Visitors can learn about the early settlers, logging practices, and the role of forests in the state's economy.

Hartwick Pines State Park also offers several recreational activities, including fishing, camping, picnicking, and cross-country skiing. The park has two campgrounds and over 100 campsites available for visitors.

Interesting facts about the area include that the park was established in 1927 and is named after Edward E. Hartwick, who donated the land to the state. The park also contains the largest known virgin stand of eastern white pine trees in Michigan.

The best time of year to visit Hartwick Pines State Park is during the fall when the leaves change colors and the weather is mild. However, the park is open year-round and offers a variety of activities for visitors in every season.