I used to live in Hoboken, and as long as you get out during non-rush hour times, there's A LOT within an hour radius. The closest (legal) park is probably Chimney Rock or Lewis Morris at about 45 min. Also within the radius you could try Ringwood, High Mountain, Jungle Habitat, Nassau, Sourlands, Dickerson Mine, Wildcat/Splitrock, Tourne. Trail difficulty varies and "more down than up" doesn't exist in elevation but in duration, it will depend on taking the right trail direction. I recommend the Maprika app to navigate new places but there are other ways with Strava, Garmin, Trailforks, JORBA maps, etc. Tomorrow, get out early while ground is frozen though.