Grasse River Wild Forest, Twin Falls and North Twin Falls. This is not easy to cross over to the island for a closer view. Use extreme caution. You can view both falls from the roadside. https://bobbieswaterfalls.com/tooley-pond-road-waterfalls-12-named-waterfalls/
Grasse River Wild Forest, Sinclair Falls, Sinclair Falls is also known as Iron Bridge Falls by the American Whitewater. https://bobbieswaterfalls.com/tooley-pond-road-waterfalls-12-named-waterfalls/, from parking at the bridge on Lake George Road, look upstream for Sinclair Falls Upper
Lampsons Falls and trail, a 1.2 mile hike if parking at road when gate is closed. Very easy walk. There are several named rapids by American Whitewater, downstream of Lampson Falls. Dan's Hole Rapid, No Thanks Rapid, North Country Boof Rapid, Old Bridge Rapid, S-Turn Rapid, Snot Rocket Rapid, Thanks Rapid, The Slots Rapid, There You Go Rapid
Grasse River Wild Forest, Harper Falls 2 mile round trip hike. https://bobbieswaterfalls.com/bobbieswaterfalls-waterfalls-of-new-york-state-and-beyond/waterfalls-of-the-northern-region-of-new-york-state/st-lawrence-county-new-york-state-waterfalls/harper-falls/, CCM Falls is also in this area, but I did not yet see it.
Grasse River Wild Forest, Rainbow Falls Rainbow Falls Trail - .25 mile 1-way, also known as Large Marge by the American Whitewater. https://bobbieswaterfalls.com/tooley-pond-road-waterfalls-12-named-waterfalls/, Use caution in this location.