If you have to choose one book to take to Paris, the Lonely Planet: Paris guide will cover all your bases. Whether you're camping, planning to splurge on a chic hotel, picnicking, or set on haute cuisine, this book gives you thousands of options. Also included is a useful 12-page overview of Parisian architecture, detailed entertainment information, notes on day trips to nearby châteaux and villages, plus 20 pages of detailed city maps, including the Metro. --Kathryn True