Adams Falls is the easiest of the major Ricketts Glen State Park falls to access. Simply pull into a parking lot and walk down over a steep bank.
Of course, easy to access means lots of people access it. Arrive just after a rain storm on a weekday when school is in session for the best odds of having no people in your way.
Otherwise be patient. Or, use a telephoto lens.
A B+W XS-Pro circular polarizer filter was used for this picture.