Kayaked down the choppy and windy Hudson a piece from the charming, granola-feeling old river hamlet of Cold Spring, NY (which was packed with cheerful strolling, shopping, and eating people) then snuck under the Metro North Hudson Line bridge into Constitution Marsh just before the tide got too high to get under it.
They rent kayaks on the river. We rent kayaks. Kayaking on ordinary waters is easy for anybody. We did a good 4 hours. The rental guy said "Use your core, not your arms, and find your core rhythm." We are not proficient yet, but we sure enjoy it. The pros give the same advice for tennis, but I still use my arms. I have no core rhythm for anything.
Those hills are the Hudson Highlands, on the other (west) side of the river. Storm King. Dramatic. The Hudson there is still tidal, but low salinity. Can barely taste salt when you splash yourself.
Did not see a lot of migrants - no Teal yet. A migrant Harrier, Osprey, and some Spotted Sandpipers, a Sharpie, plus the resident Bald Eagles, Cormorants, Black Ducks, Mallards and herons (Great Blue and American).
A recurrent thought was that this must have been great for October and November duck hunting before the Audubon Society took it over. Good for Rail shooting too. The marsh is full of Wild Rice and Cattails. In the 1830s, some guy tried to make it a Wild Rice farm, hence the kayak routes and the abundance of Wild Rice.
No powerboats allowed. You could get lost in there if they did not have water-trail markers because it is a water maze. Good fun. We kayaked down to the southern lake, and visited the Audubon lodge there (and grabbed a coffee, chatted with the naturalist, and used their facilities).
If you kayak down the marsh around 40 minutes, you turn a corner and what do you see, across the marsh, across Constitution Island, and on the other side of the Hudson?
As I recall, George Washington picked that location. The big river is narrow and defensible there, due to Constitution Island poking into it.