Ideal trip length: 2–5 days
Good fit for travelers who want island scenery, boat trips, a slower pace, and a side of Canadian history in one compact region.
The Thousand Islands region straddles the U.S.-Canada border where Lake Ontario drains into the St. Lawrence River. On the Canadian side, the area centres on Kingston — a limestone city with a deep military and maritime history — and the riverfront towns of Gananoque and Brockville.
The islands themselves are the headline: more than 1,800 rocky outcrops, some with historic cottages and castles, others uninhabited. Boat cruises, kayaking, and fishing are the classic ways to experience them.
This guide focuses on the Canadian side and cross-border day trips. Check current passport and border requirements before any U.S. stop.
Things to do
Take a Thousand Islands cruise
Operators in Gananoque, Kingston, and Brockville offer sightseeing cruises ranging from one hour to full-day excursions. Some include Boldt Castle or stop at Heart Island.
Visit Fort Henry
A 19th-century fortress overlooking Kingston and the river, with military drills, museums, and views. Check opening dates; it is seasonal.
Kayak the islands
Guided and self-guided paddling trips let you explore narrow channels and quiet bays. Outfitters can advise on routes, weather, and skill level.
Wander Kingston's waterfront and downtown
The limestone city has a walkable core, public markets, restaurants, and the Marine Museum of the Great Lakes.
Boldt Castle (U.S. side)
A Gilded Age castle on Heart Island, reachable by boat tour from either country. U.S. Customs and Border Protection processes visitors on arrival; bring passport/ID.
Where to stay
Kingston offers the widest range of hotels, inns, and B&Bs. Gananoque and Brockville are smaller bases closer to the cruise docks. Island cottages and waterfront lodges are popular in summer and book early.
Suggested itinerary
Day 1
Kingston
- Waterfront walk and Kingston Public Market
- Marine Museum of the Great Lakes
- Dinner downtown
Day 2
Cruise day
- Thousand Islands cruise from Gananoque
- Optional Boldt Castle stop
- Late lunch in a river town
Day 3
History or paddling
- Fort Henry
- Afternoon kayak rental or guided paddle
- Sunset at a waterfront park
Best time to visit
May through October. Cruises and Fort Henry operate seasonally; July and August are busiest. Fall colour along the river can be excellent in late September and early October.
Getting there
Kingston is about 2.5 hours from Toronto and 3 hours from Montreal by car or train. Gananoque is roughly an hour east of Kingston on the 401 highway.
FAQ
- Can I visit Boldt Castle from Canada?
- Yes, on a cruise that clears U.S. customs at the island. Bring a valid passport or accepted equivalent ID and check current entry rules before booking.
- Do I need a boat to enjoy the region?
- No — cruises, waterfront towns, and Fort Henry are all accessible without your own boat.
Plan this trip
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