While the named Ricketts Glen falls get the most attention, Kitchen Creek offers many opportunities for photographers.
If you want fall-colored foliage in your images, mid-late October is typically the time to go to Ricketts Glen State Park. If I had to pick a date in advance, the Oct 18-20 timeframe has been reliable. Note that the beech tree leaves in the deep ravines typically change later than the higher altitude trees in this park.
I was shooting in the rain at times on this day. The rain offers a couple of advantages. The first is that other hikers tend to stay home. The second is that there is no harsh sunlight to deal with. And yet another is that the wet leaves and rocks become very saturated when a circular polarizer filter is used.
If it rains hard enough, the steams and falls flow more strongly.