Tetra

I'm going to be be driving from the Philadelphia area to Yellowstone this summer and was wondering if anyone had any recommendations for stops along the way? The only stop I have slatted thus far is in Minneapolis to visit family, so I will be approaching the park from either the eastern or northern entrances. I won't know exactly where in the park I have to go until my background check clears, but as I don't see that being an issue, I'm trying to plan ahead for my new summer job!

Any recommendations would be greatly appreciated!