Things to do in Jefferson County

Activities, attractions and tours

A historic stone castle on a lakeside island with a clear sky.
A stone castle with towers on a lakeside island, surrounded by trees and a larger building in the background.
A stone castle with multiple towers by a calm lake, surrounded by lush greenery and a partly cloudy sky.
A historic mansion with a red roof and stone towers by a lake.
A stone structure with a statue on top by a waterfront.

Things to do

Kingston Shipwreck Cruise

Kingston Shipwreck Cruise

S$48
per adult
Kingston Shipwreck Cruise
Soar over Boldt & Singer Castles!

Thousand Islands Two Castle Helicopter Tour

S$305
per adult
100% of travellers recommend
Thousand Islands Two Castle Helicopter Tour
Kingston: Haunted Night Walking Tour

Kingston: Haunted Night Walking Tour

S$34
per adult
80% of travellers recommend
Kingston: Haunted Night Walking Tour
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Most popular experiences in Jefferson County

Tours & day trips

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3 Hr 1000 Islands Cruise from Gananoque with view of Boldt Castle

3 Hr 1000 Islands Cruise from Gananoque with view of Boldt Castle

Activity duration is 3 hours
9.0 out of 10 with 251 reviews
Free cancellation available
Price is S$51 per adult
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Holiday & seasonal tours

See all 4 activities
Alexandria Bay: Boldt Castle & Yacht House Entry Ticket

Alexandria Bay: Boldt Castle & Yacht House Entry Ticket

Price is S$22 per adult
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Water activities

See all 3 activities
From Ivy Lea: 1000 Islands Boldt Castle Scenic Cruise

From Ivy Lea: 1000 Islands Boldt Castle Scenic Cruise

Activity duration is 1 hour
8.8 out of 10 with 123 reviews
Free cancellation available
Price is S$38 per adult
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Air, helicopter & balloon tours

See all 3 activities
Thousand Islands Helicopter Tour

Thousand Islands Helicopter Tour

Activity duration is 10 minutes
10.0 out of 10 with 5 reviews
Free cancellation available
Price is S$119 per adult
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What to do in Jefferson County

Stay near popular Jefferson County attractions

A historic stone castle on a lakeside island with a clear sky.

Boldt Castle

9.4/10 (1,063 reviews)
After visiting Boldt Castle, make a plan to see the other sights and activities in Alexandria Bay. Amble around the area's riverfront or seek out the local tours.
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A castle on a small island surrounded by water.

Alexandria Bay

A coastal landscape with a lighthouse, white houses, and a ship in the distance.

Sackets Harbor