The kids are back in school, but you can all still sneak away for a quick, cheap vacation on weekends at a national, federal or state camping ground. And many camps have activities tailored to kids. To reserve a spot in one of up to 2,000 state parks, log on to reserveamerica.com For a site at a national park, try reservations.nps.gov Here are some fall-friendly options.
Rocky Mountain National Park, Estes Park, Colo.
Cost: $18 a night
Kid activities: Horseback riding, night hike, rock climbing
Ranger tip: "Though the peak season is June to August, September through...