CAMP-DO ATTITUDE
It's National Park Week, celebrated with free entrance to all national parks through April 24. But the parks can be an inexpensive vacation destination no matter what the time of year, as they let visitors come and go over the course of a week with a single entrance fee. Families and outdoors enthusiasts flock there during the warmer months -- so it's not always cheap or easy to find a place to stay. From tent camping to something a little more comfortable, there are less expensive accommodations at or near popular national parks for visitors who know where to look.