Dave--noons has it right. Investigate the Nwk Watershed and Wallkill Refuge.

I hunted Hamburg during bow and shotgun. Shotgun got a little crazy as some locals would do massive drives and then split. It was fun if you got in front or to the sides of them. I drive by 2 parking lots on Rt 23 and saw about 10 cars/trucks there the last Sat of buck season. I think that muzzle loader is wide open.

Best bet would be to find access off the beaten path and then come in from a different direction. Check out the Sand Pond Road entrance off Rt 517N.