I've thought about stream fishing. There are days where I just want to find a river where the water is just loud enough to soothe every nerve in my body.
Something like this
Do those rivers exist anywhere in NJ?
Yes, there are many beautiful streams in NJ.
Do a Google image search for Ken Lockwood Gorge, Musconetcong , Big Flat Brook, Pequest river....and there are so many more hidden gems.
There is a neat little paperback by Matt Grobert called Fly fishing New Jersey Streams. He outlines all the best rivers in the state. Without even buy the book, go to Amazon and look at his table of contents and you'll see all the rivers he covers.
But even beyond fishing these places are incredibly soothing to just walk, sit and watch. When my mother was dying I spent a lot of time in the Ken Lockwood Gorge just listening to the water. It was very helpful.