Avoid these San Francisco tourist pitfalls and save money

When you're planning a vacation, you always hear about great stuff to see and do. But you rarely hear about what you really want to know: what not to do. A heavily-visited city like San Francisco is particularly full of potential traps, and as a guide book author for the city, I know which ones snare budget travelers the most. Here are some of the things to watch out for, and some lesser-known enrichment you shouldn't miss, for your next visit to the Bay Area.