Don't wear RU gear at any of the college bars, not a classy student base in Mary Land
Oh relax. Like 25% of the students at MD are from NJ anyway, lol. PSU fans will undoubtedly get a bit more, but just don't be a jackass and you'll be fine.
My recommendation is always to stay in DC and take the metro over to College Park on game day. There are infinite shuttles going to campus/parking lots, and you won't have a problem. The bar scene is average at best, but the food is pretty good. Nando's above is a good recommendation, but go to Cornerstone or Bentley's if you want to experience College Park the real way.
Other option would be to stay in Annapolis. Gorgeous place with fantastic restaurants. Difference there is that you're driving in on game day. There are plenty of lots around the stadium to park/tailgate, though I would recommend trying to find a YELLOW pass if possible. Good lot and won't be filled w students.
You could always stay right on Route One in College Park, but it's not something I recommend unless you are literally there to go to the game and leave. If you do choose to do that though, drive to Franklin's Brewery for dinner. Probably 10-15 minutes down the road in Hyattsville (right across from Dematha).