If you're planning a trip to San Diego, consider buying some or all of these items before you go. Some will save you money, and others will make your trip easier.
1. Lonely Planet Guide - San Diego
A guide to San Diego and Tijuana.
2. Southern California: Moon Handbooks
Consider this guide if you're visiting more than one Southern California destination.3. San Diego Zoo
Buying a membership in advance may cost you less than buying separate admissions to the Zoo and Wild Animal Park. As a bonus, you get their magazine for a year.