Look no further then America's National Parks for an exciting and budget friendly vacation this summer. That's the advice from Outdoor Life magazine, which ranks the nations top 12 national parks in its June/July 2008 issue. The magazine, which has highlighted outdoor adventure for more then 100 years, breaks its top National Park picks into four categories, recommending parks that offer adventure, solitude, family-friendly vacations and overlooked gems. The June/July issue of Outdoor Life, on newsstands now, also features reviews of national parks from coast to coast.