Dating a pretentious man
Watch for petty muggers who grab your bag when you are distracted and take note of the bad areas in Valparaiso.
If you're only going to visit only Chile then I recommend you get this guide, which is far more detailed than the continental guide below, with options that cater to a range of budgets instead of only the shoestring backpacking crowd.
Get ready for some sticker shock if you are coming from other countries because it is more expensive here.
While it is not as expensive as Brazil, expect to drop at least a day here for things you can do in other South American countries for 20% less.
The maps are excellent, the information is complete and thorough, and the reviews are accurate, which is why it's often called "the bible" by many travelers.
Chris Martin was that guy dancing between Bruno Mars and Beyonce at the Super Bowl, after all.
Also it gives more respectable treatment to small cities and towns that the larger guide breezes over with a paragraph or two.