Still haven't decided on holiday plans? Don't fret. Though many of the campgrounds that accept reservations are filled to the max, there are a number of beautiful campgrounds that are available on a first-come, first-served basis. These sites are often a bit further from the crowds and may offer fewer amenities, but are well worth it. The primitive campsites listed below are some of our favorite gems, be sure to leave them better than when you arrived. Head out Friday morning, if not Thursday evening, for your best chances of getting a site. Trust us, it's not too late to make this vacation one to remember.