Is that a bike path or a road? Sounds like a good option if I want to forgo a long trainer ride in a hotel gym or parking lot!
It's a road - most of it is in decent condition and has wide shoulders, and it's labeled as a cycling route. It's the go-to route for cyclists coming out of the city headed north. If you make it south enough on 9D (about 15 miles) to the Bear Mountain Bride you'll be treated with some pretty nice scenery.
If you want a challenge climb Bear Mountain (https://goo.gl/maps/fV6DVrMZU2s
) - usually takes about 20-30 minutes and on a clear day you can see NYC.
Strava 1999 LC Jr Nats 200m Fly Champion