Another route I often enjoyed in my NYC days was from home to Piermont. One can go via 9W or Henry Hudson Drive (HHD), and I’ve mapped both for you with the HHD bit in purple.
In the city, I tended to use Riverside Drive, rather than the greenways to get to the GWB because it was faster and I don’t always have enough fear for my own good. (I took the Manhattan Bridge with the cars once on my bike. I can assure you this was not wise.) Taking Riverside Drive is totally OK, though. I wouldn’t suggest anything intense on here.
Anyway, as before: look at the underlying googlemap, as I’ve left notes on the markers to help.
Any suggestions/ amendments, let me know!