It's one of those, I know it when I see it sort of things. There are a lot of factors to consider that are as different as Cal-coastal and Camino Real cities. For example, a student in San Louis Obispo who uses a bike to get around may not dress in clips, leg warmers or have a pattern of the rising sun on the back of a wool jersey but they have a home base and I don't believe are going to be confused with a homeless person on a bike. A "real tourist" on the Route 1 in San Clemente, for example, will be going from someplace north to someplace south or vice versa unless they're staying there for the night in which case they'll be riding around unloaded as all their gear is at a campsite or hotel room and in any event, they'll be all washed off.