Parks, Recreation and Historic Preservation

Mary Island State Park

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Access is by boat only, from either Grass Point State Park (4 miles over water), or Keewaydin State Park, which is 2 miles from the island.

1000 Islands, NY 13624
Latitude 44.365453068199997
Longitude -75.921706115999996

Mary Island State Park comprises 12 heavily-wooded acres with steep rocky outcroppings offering spectacular views of the Canadian shore or the shipping channel. Boats may be beached or moored near campsites. The park has a picnic area and several foot trails.

Access By Boat Only Boat rentals are available nearby, call the park for information.

Must have proof of current rabies vaccination - certificate inoculation or dated collar tag. Household pets only, caged or on a leash, not more than 6 feet. Not permitted in picnic areas.

Mailing Address
c/o Cedar Point State Park
36661 Cedar Point State Park DriveClayton, NY 13624

Hours of Operation

  • Open from Memorial Day to Labor Day weekend.
  • 2015 Camping/Cabin Season: 5/22 - 9/7
  • Boat Dockage: 5/22 - 9/7

Fees & Rates

Most New York State Parks charge a vehicle use fee to enter the facility. Fees vary by location and season. A list of entry fees and other park use fees is available below. For fees not listed or to verify information, please contact the park directly.

Your key to all season enjoyment of state parks is our season's pass. For $65, the Empire Passport provides you unlimited day use vehicle entry into most of our parks. Apply on-line or call your favorite park for more information.

  • Boat Dockage
  • Day Use $6
    Overnight $19 (prime)

    Weekend/Hol $4
    Out-of-State $5

  • Campsites
  • $20/night

    *Additional $5/night for non-NYS residents

  • Vehicle Entry
  • Day Use $6
    After 4 PM $4

    Toll Booth Hours:
    5/22 -9/7: 8:30AM to 3:30PM


Firewood source maps show a 50-mile radius from which untreated firewood may be moved to this campground. For more information see firewood restrictions.

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Amenities, Activities & Information

  • Amenities
  • Campsites
  • Dockage
  • Grills
  • Picnic Tables
  • Powerboats
  • Activities
  • Fishing