We visited CNP in 2022. The park is beautiful considering the otherwise unassuming landscape of the area. Note it is basically surrounded by city, so it makes for an interesting experience. We enjoyed the big hitters including the Ledges, Brandywine Falls, Bridal Veil Falls, Blue Hen Falls, Tinkers Creek Gorge, and both visitor centers. That was a full day and didn't allow us to ride the Scenic Railroad, hike as much as we wanted, or to get out on bikes or kayaks. Two full days or three relaxed days would be best if you had the time.