A long time ago when I had my first motorhome we stayed in at Merry Knoll Campground in Clayton, NY. It was a very nice campground and had big sites. It also had a boat launch into the St Lawrence River.
While there take a Sam Tour to Bolt Island and in fact just take the boat ride. You also can go across the river via a bridge into Canada and then into Kingston. While on the bridge climb the tower that gives the view of the 1000 islands. From there take the ferry to Wolf Island and then another ferry to Cape Vincent back to the states and then Rt 12 back to Clayton.
We really enjoyed our trip there, however we went trailered a boat which was a lot more fun into the river. In fact I used the boat to go to the locks in Kingston which are operated by hand.
You can also go to Messina and see the lock and the power station.
2014 Winnebago Adventurer 35P,Ford F-53, V-10
2011 Ford Escape,2000 Roadmaster Tow Dolly
"Have a Great Day, Enjoy RVing."