Sorry, been AWOL. Not 100% what you're looking for, but if you want an adventure, go down Pirozzi Ln. Last driveway on the left, turn right into the brush. You can ride that across to Montgomery, cross Montgomery to N Hill and finally to Montgomery. I thought I was going to get shot at N Hill my first time there; homeowners there feel like isolationists/nationalists. Follow the pipeline out to fields, turn left at the start of the fields, cut down the first split in the fields and you'll make it to the road (muddy AF here, expect to sink). Go left up Lindbergh to Ridge Road, jump in the Sourland Mountain Reserve, hook up that with a bushwack to Hunterdon County Sourlands (all rideable, follow the side of the stream beds) cross Rileyville, and you can find deer trails and get to Amwell Lake WMA. That's where I have stopped - so close to Water Co. Be prepared with tools, water and tubes. It's a long ride physically and mentally. I'll connect it to Lambertville. Just need a little more time to explore. My advice - if you think you see a trail, take it. That's as good as it gets in some spots.
Give it a shot. Stay outta sight and low key. I'm not sure who owns what land parcels. Don't Strava it please!