Mapquest will tell you that DuBois is 79 miles from Latrobe, Pa., home of Latrobe CC, the course Palmer grew up playing. I grew up in Pittsburgh and never played it, but it's on my list for before I die. No one will tell you it's a great course, but it's Arnie's course, and the layout supposedly hasn't changed much.
Pittsburgh of course has Oakmont, but I love Fox Chapel--which I played as a kid--a fabulous Raynor layout, though it's not the Stern Test of Golf that Oakmont is. Fox Chapel got great reviews as host of Curtis Cup a few years ago.
If you like golf history as I do, and are traveling east to New Jersey at some point, try Hershey. I also favor Eagles Mere Country Club--truly in the middle of nowhere--an old Flynn layout that was once a resort course for a bunch of hotels, and now a private club. It's Flynn light, not a great course but a slice of time that has not changed much. Don't try Eagles Mere before June--the weather in the mountains is too chancy in April and May, and don't expect great golf. Do expect a charming older course in a beautiful setting.
Pennsylvania has other excellent private courses, mostly near Philadelphia, Pittsburgh and Bethlehem, many of which are noted in GCA files.
Enjoy your trip.