Once again, the Lonely Planet series has a few great books that can make your trip to France much more enjoyable. If you're on a trip to Paris only, get the Lonely Planet: France, Lonely Planet: Paris, and City Map: Paris. If you're on an extended trip to France and are checking out the famous Loire Valley, Lonely Planet: The Loire is indispensable. Frommer's and a few others might look appealing, but they're not nearly as good as the Lonely Planet for France series.