We just bought a couple of camping cookbooks, I quite liked
this one. I also really liked this
article. I know you're a group of men, so am guessing that you'll want meat - but vegetarian food is going to be easier to deal with as fresh food - Indo-pak food is remarkably well-suited to camping, you can (I've never tried, but have heard) make killer naan on a campfire, and the components aren't going to go bad on you in 4 days - you can up the testosterone level by increasing the chili. You may or may not want to refer to
this thread with some of my past experiences car camping; I tend to prefer preserved (canned) foods on camping trips, YMMV - but I do recommend having a large fresh bouquet garni that you can use bits of here and there. We've also found that it is important to bring some kind of alternate fuel: there are now all kinds of rules about firewood (can't bring it in from outside, can't pick it up off the ground, etc.) and you want a plan B. We carry a cheap propane stove (like you can get at an Asian grocery) and a sterno cooker, just in case.
However you do it, make sure you have access to a good camping cookset (NOT non-stick if you're cooking over an open fire, they can't take the heat) and some kind of good equipment/water for washing up; you're really going to miss them if you don't have them. I like
these for washing up but sometimes they are hard to find. The campsite should be able to let you know if you need to buy a bear-proof food container (some even offer them)