As when I lived in Ossining I sometimes take walks in nearby parks on weekends weather permitting. In general I liked the trails in the Ossining area better than the ones around Princeton. One problem with New Jersey is that the trails can get muddy. However I have found some satisfactory places to walk near my new home. Recently I have been venturing a bit further afield including to the Sourland Mountain Preserve which according to google maps is 23 minutes from my house. A trail map can be found here.
I have mixed feelings about this park. The trails have a lot of rocks and exposed roots which can make hiking unpleasant. In addition while you are walking up a mountain (or what in New Jersey passes for a mountain) with several hundred feet of elevation gain the area is heavily wooded so for the most part the views aren't very good. There is one exception, a natural gas pipeline cuts through the park and the right of way has been cleared of trees. This leads to some good views including one on a clear day of the New York City skyline which is about 40 miles away.
Referring to the trail map linked above starting from right-hand-side of the parking lot the skyline view can reached by following the trails through the points labelled 1,2,3,C,4,5. Then looking downhill on a clear day the NYC skyline can be seen from the right-hand-side of the cleared area where the bench is. It is on the horizon beyond the nearby white domed building. It is then an easy albeit a little steep in places walk down the pipeline cut back to the parking lot (through locations labelled C,13,TH).
I took photo Sunday, May 7, from near the bench. I used a cheap Canon camera which does however have a telephoto lens. Photos taken using my phone or my camera without using the telephoto feature didn't show the skyline very well. The photo is about what you can see with the naked eye. I also had a pair of binoculars which gave a better view. The big tall building above the center of the white dome is One World Trade Center (aka the Freedom Tower). This was a relatively clear day, I have been there on two other days when the skyline was just an indistinct smudge on the horizon although still visible if you knew exactly where to look.