I like this book over-all, it has a lot of great information about visiting observatories and science locations. For example, I've been to Mauna Kea and Palomar Mountain, and I learned some new information about visiting them from this book.
Each site is introduced with a good description of the historical and scientific character of the facility, and there are pointers to special features or easily missed displays that are worth hunting down.
As a Bay Area resident, I have a major gripe: While the book lists Ames Research Center in Mountain View and Lick Observatory near San Jose, it ignores Chabot Space and Science Center in Oakland. This is puzzling, since both Ames and Lick have very limited options for tours by the public - Lick is open during the day, but only has night time viewing on a few nights each year. Ames has a nice visitor center, but the only time you can get inside the gates is for the Air Show (or to film a MythBusters episode).
To contrast, Chabot is open to the public most days of the year, and has public telescope viewing every clear Friday or Saturday night. The planetarium and Mega-Dome theater are world class. For telescopes, Chabot's 20" refractor and 36" reflector dwarf the telescopes available at most public observatories, including some that are praised in this book.
The author asks for suggestions for future editions, I know he'll be receiving some from Chabot fans...
The book includes a section on visiting Roswell and Area 51, this is good for amusement value. There are also pointers for visiting some of the great space related museums and NASA facilities. The last chapter is a helpful list of ways have fun with space science - I can vouch for the joys of star parties and solar eclipse travel, but I will have to delay the sub-orbital flight until the prices come down.
Overall I think this is a useful and interesting book, but make a point to check out the Chabot center if you are looking for astronomy in the San Francisco Bay area!