I visited in mid-May. It was extremely hot, and there were tons of insects flying around, making it more of an adventure than a walk. However, I was soothed by the lush green trees, a different sight from autumn. The water was also very cold and refreshing. However, there are a lot of bees and other insects, so be careful in the summer. Also, there aren't many places to rest.
Although there aren't many parking spaces, the turnover is quick, so even if you wait, a space will open up in just a few minutes. Also, I think it's only crowded during the autumn foliage season, so at other times, there should be plenty of parking available.
The scenery was beautiful, and the sound of the river and birdsong was very soothing.