I recently spent an afternoon at the Great Falls National Park and highly recommend that you go there too. Fishing, hiking, taking photos, wandering around - anything will do. To me, being outside is such an important way to re-charge and to appreciate my surroundings. The park offers a variety of views and you will certainly come across turtles resting on tree branches and birds searching for prey.
The park is also a great inspiration for color - the photos below show the wonderful combinations nature comes up with and that can be then applied across various fields of interest. For me, that is fashion - I often look for inspiration in nature and photographs taken around the world. The dark blues of the water would go so lovely with the pale sandy color of the rocks - I can see a dress design in my mind already! The dark greens of the trees could be paired with the purples/reds of the Fall - would it make for a lovely blouse?
So, put Great Falls on your Fall list - it is definitely worth visiting!