I made a one-month, 7,000-mile cross-country train and bus trip once, from the US east coast to the west and back, with nothing but an Olympus Stylus Epic and a dozen rolls of film. The main motivation was space: I made the entire trip with just a single large backpack (the only other camera I owned at the time was a Calumet 4x5). I truly enjoyed being just another tourist with a camera, instead of being "Mr. Serious Photographer." I got nice photographs, too.