I went to San Diego Zoo 2 weeks ago and found out that my guest passes, even though I had 2 that said Wild Animal Park and 2 that said San Diego Zoo could be used at EITHER place. I ended up using of of the tickets that said Wild Animal Park at the Zoo which saved us some cash : ) I wouldn't have known except that I was in line with membership services waiting to buy an extra membership and the assistent explained that I could use the passes at either Hope this is clear and might help someone!
Jenn
Jenn