Mary Island Professional Guide
Detailed Trail Description from our Guidebook
"Like Cedar Island farther north, Mary Island State Park seems puny when compared to some of the gigantic campgrounds in the Thousand Islands region. In some ways though, the small size is an asset, with unobstructed views of the Canadian coast and the scenic shipping channel. A dozen sites are well dispersed on this rocky piece of land, with a single comfort station and a picnic area to share between them. The nearest public boat launch is at Keewaydin State Park, 2 miles away by water. Boat rentals are available here as well as at Wellesley Island State Park Marina to the west. A trip to or from Keewaydin will pass Boldt Castle on Heart Island, a six-story, 120-room mansion built by millionaire George C. Boldt that’s open to visitors from mid- May until the end of September."