One of my favorite places to visit is Aysgarth falls in North Yorkshire. When you arrive there are two possibilities for parking. One is near the pub as you arrive at the village. From the park you can walk down the hill to the falls. Your other option is to drive down the hill over the river Ure to the national parks car park. Whichever park you use easily leads you to a well defined path along by the falls. The path is probably best described as gently undulating and fairly easy walking. You do have to be careful if you go off the path, which was my undoing. I slipped on a rock and fell backwards hurting my back and I have been suffering from sciatica since the visit. Ouch!!!
I do tend to visit Aysgarth after heavy rain for two reasons. The first is obviously there is more water flowing though there is usually a good flow at most times. The second and most important reason is that it does add color to the water. The falls are split into the upper falls, mid falls and the lower falls. The mid falls for photography purposes are too limited for access. There are plenty opportunities for something different with the upper and lower falls.
Not everyone likes the effect that long exposures give you on water. It can look a little like plastic. I love the effect but whether you use it is your choice. Photographing fast flowing water with color in it can look very messy. The long exposure gives you more distinct, cleaner colored lines. Here I used a 10 stop neutral density filter and had an exposure of 15 seconds at f22. The best thing you can do is try different ways and see what you like.
Go out and create some beautiful images.