Allan H. Treman State Marine Park is located in Ithaca, New York and offers visitors a variety of outdoor recreational activities. The park is situated on the shore of Cayuga Lake and covers 91 acres of land and water. Visitors can enjoy swimming, boating, fishing, and picnicking in the park.

One of the main attractions of the park is its boat launch, which provides access to Cayuga Lake for boaters and anglers. The park also has a swimming area with a sandy beach, playground, and picnic tables. Visitors can also hike on the park's trails, which provide scenic views of the lake and the surrounding landscape.

Interesting facts about the park include its namesake, Allan H. Treman, who was a former commissioner of the New York State Department of Environmental Conservation. The park was also the site of a former Cornell University rowing course, which was active in the early 1900s.

The best time to visit Allan H. Treman State Marine Park is during the summer months, from June to August, when the weather is warm and the water is suitable for swimming. The park is open year-round, however, and visitors can enjoy winter activities such as ice fishing and cross-country skiing.

Overall, Allan H. Treman State Marine Park is a great destination for outdoor enthusiasts looking for a variety of activities in a beautiful lakeside setting.