Exiting the park was really slow-going (because everyone constantly stops to look at the wildlife alongside the road), and we fretted as the minutes ticked by, knowing we would not be able to make the 5:00 deadline for returning the rental car (which we were able to do simply by leaving it at the RV park). We parked it at the RV campground office around 5:20--the gal inside said she’d tell the car company that we had it back by the 5 pm deadline. Woohoo! (Yellowstone Grizzly RV Park, $38/night)