It's the classic budget honeymoon: hop in the car and hit the open road with a little cash and a big spirit of adventure. Jamie Jensen, author of Road Trip USA, has just the website to whet your appetite. At roadtripusa.com, he profiles eleven classic road trips: the West Coast from Olympic National Park to the Mexican border; Highway 93 from the Canadian Rockies to the Sonora Desert; U.S. 83 ("the Road to Nowhere") from Manitoba to Texas; the Great River Road (see below); the Appalachian Trail (by car); an East Coast route from Atlantic City to Key West that runs within earshot of the ocean; U.S. 2 from Seattle to Maine's Acadia National Park ("the most stunning and unforgettable, not to mention longest, of all the great transcontinental road trips," according to Jensen); the Oregon Trail from Cape Cod to Oregon; little-known U.S. 50 from San Francisco to Washington, D.C.; U.S. 80 from San Diego to Savannah, Georgia; and the Mother of All Roads, Route 66.