Not a terrific trail. It was nice for the first time, don't intend to run. A majority of the trail is beside a busy road, completely removing the immersion. The trails are VERY poorly marked and confusing. Terrain extremely easy, in fact we passed a couple pushing a stroller. Biggest redeeming quality is the incredible view of Manhattan near the trail. It was clean and well maintained.
Eagle Rock was 2 miles away from my home and I hiked there frequently the past 2 years. It offers great views on the NYC skyline, especially when the lights in the city come on in the early evening. Although the park is small, you can combine the well-blazed trails into different routes. I'd categorize all trails as easy, but there are some that let you hop over a small stream or climb a bit. I really liked hiking there with the dogs in the fall and winter. The park is surrounded by densely populated areas and you'll see people there all the time, except in the winter. If you prefer to be alone on the trails, South Mountain reservation is close by and is a lot less visited.