If you like waterfalls & hiking, I don't think you can beat Ricketts Glen State Park in PA. Within the park is a pair of streams with 21 waterfalls. Described as "strenuous" but that is mostly because of the steps that climb around the individual falls - I managed the hike the last time at age 74.
Because there is a considerable drop between the top of the stream & the bottom, you will find the season changes as you work your way up or down. The campground are dry, but bathrooms with showers. If you approach from the south, there is a 2 mile, 18% grade up to the park. Relatively flat from the north.
Some more photos
here.