Mary Island State Park
Mary Island State Park is a secluded 13-acre park located on the St. Lawrence River, accessible only by boat. It offers scenic views, tranquil picnic spots, and excellent opportunities for fishing, boating, and camping in the heart of the Thousand Islands region.
Free
Visiting with Dogs
Dogs allowed on leash; not in buildings or swim areas. Owners must clean up and supervise pets at all times.
Visitor Tips & Reviews
What Visitors Say
Loved for its boat-only access, peaceful campsites, and stunning river views, Mary Island State Park is a secluded gem perfect for nature lovers seeking tranquility and adventure.
Tips from Visitors
- Accessible only by boat; plan your transportation.
- Pack all necessary supplies; limited facilities available.
- Carry out all trash to keep park clean.
- Check weather conditions before visiting.
- Fishing and picnicking are popular activities.
- Respect wildlife and natural habitats.
Amenities
Nearby Attractions
Explore these attractions near Mary Island State Park:
- Boldt CastleA historic castle on Heart Island, famous for its romantic architecture and gardens, accessible by boat tours.2 miles away
- Alexandria Bay VillageA lively riverside village with shops, restaurants, and boat tours, serving as a gateway to the Thousand Islands.2 miles away
- Thousand Islands National Park (Canada)A scenic Canadian park offering hiking, boating, and wildlife viewing across several islands in the St. Lawrence River.6 miles away
Things to Do at Mary Island State Park
Camping at Mary Island State Park
Boat-access tent camping only; no hookups or water. Reservations required. Primitive amenities. Open late May–early September.
Hiking Trails
Mary Island State Park offers a unique hiking experience accessible only by boat. Trails wind through scenic woodlands and along the shoreline, providing peaceful views of the St. Lawrence River. Hikers enjoy the park’s quiet atmosphere, abundant wildlife, and well-maintained paths. The island’s compact size makes for easy, leisurely hikes suitable for families and nature lovers seeking a tranquil day outdoors.
Mary Island Perimeter Trail
EasyA scenic loop trail that circles the island, offering views of the St. Lawrence River and opportunities for wildlife spotting.
North Shore Lookout Path
EasyA short trail leading to a picturesque lookout point on the island's north shore.
Island Interior Nature Walk
ModerateA winding trail through the wooded interior of Mary Island, featuring interpretive signs about local flora and fauna.
South Point Picnic Trail
EasyA gentle path leading to the southern tip of the island, perfect for a picnic with river views.
Directions
Accessible only by boat from Alexandria Bay; public boat launches are available nearby for access to the park.
Contact & Info
Frequently Asked Questions
How do I access Mary Island State Park?
Mary Island State Park is only accessible by boat. There are no bridges or ferries, so visitors must use private watercraft to reach the island.
What amenities are available at the park?
The park offers picnic tables, grills, docks, and primitive campsites. There are no restrooms or running water, so visitors should plan accordingly.
Can I camp overnight at Mary Island State Park?
Yes, primitive campsites are available on a first-come, first-served basis. Reservations are not accepted, and campers must bring all necessary supplies.
Is fishing allowed at the park?
Yes, fishing is popular at Mary Island State Park. Anglers can catch bass, pike, and other species in the surrounding waters.
Are pets allowed on the island?
Pets are allowed but must be supervised and kept on a leash at all times. Owners are responsible for cleaning up after their pets.
When is Mary Island State Park open?
The park is open seasonally, typically from late May through Labor Day. Check the New York State Parks website for current opening dates and hours.