Went on a Dashiell Hammett walking tour of SF today. I had done the same one over 20 years ago and the same guy is doing it. Pretty entertaining and definitely a workout. It's over 4 hours and plenty of hills, too.
One of the highlights is a visit to one of Hammett's apartments, which also happens to be the same as Sam Spade's apartment in Maltese Falcon.
The guy is a character and you get plenty of personal asides as well as info about other authors and general SF history. It's only $10, and you DEFINITELY get your money's worth.
If you are in SF, it's worth checking out. Here's his web page: Don Herron