If you arrive Friday night and would like something to do before the wedding, Nay Aug park in Scranton is about a 15 min drive from Clarks Summit. There is a couple of nice easier hiking paths with a pretty treehouse and waterfall.
Katie's favorite park in the area. There is a great walking path around and some nice hiking trails as well. It isn't too far from the venue, they may have boat rentals too.
Need I say more? Located at Cooper's Seafood House, you can get all of your Office memorabilia here!