If you are going to do San Diego in conjunction w/DL, the S. California CityPass is the best deal around:
Southern California CityPass® Information:
Admission to the following six attractions:
3-day Disneyland® Resort Park Hopper® Ticket
1-day admission ticket to Knott's Berry Farm Theme Park
1-day admission ticket to SeaWorld San Diego
1-day admission ticket to the San Diego Zoo OR San Diego Zoo's Wild Animal Park
Booklet is valid for fourteen days beginning the first day you use it.
Adult = $149.99
Child = $114.99
These prices are available @ Costco stores. You can also buy them @ DL, but the price is higher.