I'm with the others. I'd say to be a good hostess, but you don't need to go out of your way for them. Heck, you're already providing a place to sleep (and shower, and hang out)! But, if your guests are anything like my in-laws... they do expect to be tended to... ugh, I had to stock up on sodas since they're all addicted, and special freezer meals for my nephews (who only eat chicken nuggets & french fries), and tons of snack (chips, cookies, etc) because NONE of them eat healthy stuff!
If they have a car, provide directions to the closest couple of grocery stores/fast food with a simple "I'll be home at 5:30 to cook dinner, fend for yourselves for lunch." :) If they don't have a car, you could have someone take you to work and leave your car with them... Yeah, I have a hard time doing all this for people because I absolutely do NOT expect people to do this for me!
Anyways, good luck with the guest and best wishes for the wedding!