Papa John's is on College Avenue, right near The Astro. It's pretty much what you'd expect, and probably exactly the same as every other Papa John's in the country. They run the standard college-town specials, which change every semester, so give them a call to find out the current ones. In the past, you could get a large one-topping on Tuesdays for $5 flat (pick-up only). They have a small dining room and a few tables outside, but the place is usually so busy with people picking up their orders that you probably wouldn't want to eat there.
The building it occupies is a remodelled Texaco service station.
501 College Ave
Clemson, SC 29631