Watertown, NY in a nutshell
Watertown lies on the Black River in Jefferson County, New York. The city is a base, not the river itself. The Thousand Islands are an archipelago where Lake Ontario flows into the St. Lawrence River, on the border between New York and Ontario. River towns such as Alexandria Bay and Clayton lie to the north and northwest. Clayton is about 20 miles (roughly 32 km) northwest of Watertown.
This guide covers Watertown itself, with its Public Square, museum, mall and Thompson Park, and the places people visit from here: boat tours, Boldt Castle, Singer Castle, Alexandria Bay, Clayton, Sackets Harbor, Wellesley Island, Cape Vincent and Kingston in Ontario. It also explains what a civilian visitor can expect at Fort Drum, and covers wineries, restaurants, weather, getting there and hotels. Prices are as listed for 2026 and can change.
Our picks: Watertown and the Thousand Islands
The flight from Watertown airport is the only pick that starts in town. For most people the Clayton cruise on the US shore is the simpler way onto the river, and the glass-bottom boat adds a lighthouse stop with admission already paid.
Hand-picked tours, booked through GetYourGuide and Viator. Prices are indicative starting prices in US dollars (as of October 2026). Tap a tour for live availability and the current price in your currency.
Scenic flight from Watertown airport
- Boldt Castle and Yacht House views
- Thousand Islands Bridge
- Both sides of the river
The flight starts and ends at the airport near Watertown, not on the river. You see Boldt Castle from the air only, so no castle admission is part of it.
Check availability →
Glass-bottom boat cruise with Rock Island Lighthouse
- Glass-bottom boat cruise
- Rock Island admission
- Local naturalist guide
Leaves from Clayton on the US side, and the lighthouse stop needs no extra ticket. Boldt Castle is not part of the listing.
Check availability →
Clayton cruise with a Boldt Castle option
- Sightseeing boat cruise
- Local naturalist guide
The boat leaves from the US shore with a naturalist guide on board. Boldt Castle admission is bought separately and is not listed among the inclusions.
Check availability →Thousand Islands tours and day trips
Castle cruises, river boat tours and day trips from Watertown and Alexandria Bay, with live prices and availability.
Plan your trip
Start with what to do in town and on the river, then pick the places you want to see.
Things to do in Watertown
Public Square, a downtown walk, the museum and the Wednesday market.
The Thousand Islands
Where the islands lie, how the border runs and what the bridge toll is.
Thousand Islands boat tours
Departures from Alexandria Bay and Clayton, tour types and fares for 2026.
Tours and day trips
Boats, castles and day trips around Watertown in one overview.
Boldt Castle
Heart Island admission, boat access and the 2026 and 2027 seasons.
Singer Castle
A guided visit on Dark Island, reached by boat.
River towns, parks and border crossings
Each place has its own page with hours, prices and practical notes.
Alexandria Bay
The main departure point for boat tours across from Heart Island.
Clayton
The Antique Boat Museum and the Thousand Islands Museum.
Sackets Harbor
The War of 1812 battlefield, the village and the lakefront.
Wellesley Island State Park
Camping, trails and the nature center on the river.
Cape Vincent and Tibbetts Point
A lighthouse where Lake Ontario meets the river.
Thompson Park and the zoo
Views, trails and Zoo New York in Watertown.
Kingston, Ontario
A day trip across the border, with passport and Fort Henry notes.
Thousand Islands Winery
Tastings and tours in Alexandria Bay.
Eat, sleep and get around
Practical pages for the weeks before you travel.
Restaurants
Where to eat in town, at the mall and in the river towns.
Hotels and where to stay
Which area suits your plans, plus camping on Wellesley Island.
Airport, bus and driving
Flights to Watertown, buses and city transit.
Weather and best time
Monthly averages, lake-effect snow and which season fits which plan.
Visiting Fort Drum
Civilian visitor basics and lodging in Watertown.
A few things to know before you go
Seasons, tickets and border rules that shape most trips.
Boldt Castle is a seasonal visit
The 2026 season ended on 12 October, and the next opening is announced for 8 May 2027. Singer Castle visits ran until 18 October 2026. Plan castle days for late spring to early October.
Boldt Castle →Castle ticket and boat ride are separate
Heart Island can only be reached by water. The admission ticket does not include transport from the mainland. A combined castle and Yacht House ticket is also not a boat ticket.
Boat tours →The Cape Vincent ferry is not running
Horne's Ferry between Cape Vincent and Wolfe Island does not run in 2026, so it is not a shortcut to Kingston. The Kingston to Wolfe Island ferry is a different crossing. For Kingston, plan to drive over the Thousand Islands Bridge.
Kingston, Ontario →Tibbetts Point is a visit to the grounds
The lighthouse tower cannot be climbed, and the former hostel no longer offers beds. The grounds are free and open around the clock, year-round.
Cape Vincent →Bridge sidewalks close for winter
The walkways on the Thousand Islands Bridge are announced to close at dusk on 30 October 2026 until spring 2027. Cars use the roadway all year. The standard car toll is $4 or CAD 5.50 in 2026.
The Thousand Islands →Passport rules for Canada
As of 6 August 2026, travelers who do not need a visa and enter Canada by car or boat from the US do not need an eTA, but do need a valid passport. This does not replace a visa for nationalities that require one.
Border notes →Seasons at a glance
2026 calendars. Check the current schedule before you go.
| Place | 2026 season or hours | Admission 2026 |
|---|---|---|
| Boldt Castle (Heart Island) | Ended 12 October; reopening announced for 8 May 2027 | $14 ages 13 and up, $10 ages 5 to 12 |
| Singer Castle (Dark Island) | Visits until 18 October | Included in the Singer Castle boat tour from Alexandria Bay: $50.75 adults, $34.25 children 5 to 12 |
| Wellesley Island State Park | Park all year; camping 1 May to 11 October; swimming 29 June to 7 September | $7 per vehicle at peak day use |
| Fort Henry, Kingston | Main season 16 May to 7 September | CAD 20 for ages 25 to 64 (plus HST) |
| Zoo New York, Watertown | Currently daily 10 a.m. to 5 p.m. | $12 ages 13 to 65, $9 ages 3 to 12 |
| Tibbetts Point grounds | Open all year, around the clock | Free |
For most first-time visitors, a trip between May and early October fits the castles, the boats and the parks together. Winter suits town and park days, with snow and cold. See weather and best time for monthly averages.
Watertown, NY: frequently asked questions
Is Watertown on the Thousand Islands?
No. Watertown lies on the Black River. The Thousand Islands are on the St. Lawrence River to the north and northwest, with river towns such as Alexandria Bay and Clayton as the usual starting points for boats. See the Thousand Islands page.
When can I visit Boldt Castle?
Only in season. The 2026 season ended on 12 October, and the next opening is announced for 8 May 2027. Admission is $14 for ages 13 and up and $10 for ages 5 to 12, with children up to 4 free. You reach Heart Island by boat. See Boldt Castle.
Do I need a passport for a Thousand Islands boat tour?
Tours from the US shore that do not land in a foreign country need no passport or visa with some Alexandria Bay operators. That is not a general exemption, and it does not cover landing in Canada or entering the US from Canada. Read the details on the boat tours page.
Which airport serves Watertown?
Watertown International Airport, with American Airlines nonstop flights to Philadelphia twice a day. Other destinations reached via Philadelphia are connections, not direct flights. Buses and the road route are on the getting there page.
Can I visit Fort Drum as a tourist?
Fort Drum is an active military installation, not a sightseeing destination, and access is controlled. A hotel booking in Watertown does not give you entry. The Fort Drum page explains the basics for civilian visitors.
Is Watertown-NY.org an official site?
No. This is an independent travel guide, not run by the City of Watertown, Jefferson County, a tourism council, Fort Drum, a castle or any tour operator.