We're traveling to Bethlehem, Pa. for a wedding and staying a few days. Anything interesting to do while we're there?

The first thing to do is repost your request with a must more clearly defined title. (For example, "Going to Bethlehem, PA. What shouldn't we miss?")

Perhaps you can find some ideas here:
http://www.lehighvalleypa.org/default.aspx?pageid=12

seriously, wear those red and green shoes, buy cheap local beer and reserve a bowling lane! For maximum impact, combine the three.

I recommend this based on a personal experience ... it was a dark and cloudy day in that same area, rainly, and the art museums and foreign flick houses were close, the symphony was in rehearsal, and they were between Wagnerian operas. One had to go local, and this all-Amercian pasttime was available at 25 cents/pp/pg. In the process, we discovered an apparent relationship between beer consumed and gutter ball frequency. Lots of laughs. Have a bowl!

What a bargain! 25 cents/pp/pg? You must be joking! Here in Elimsport, Pennsylvania we are lucky enough to have an indoor entertainment center, so we have to just sit around shooting squirrels and such!