How do you get a vip in your zoo on zoo tycoon 2

Well first off make sure your zoo has a lot of stars! I think it takes like 3 1/2 to get a VIP in your zoo. Make sure you have music rocks, food stands, donation places, and make sure your guests come back! After a while one should come in. But I think that you can only get a VIP in your zoo in Campaign or Challenge mode or whatever.