Last summer my granddaughter and I visited the Saint Louis Zoo in St. Louis, Missouri. Zoo admission is free. However, we opted for the Adventure Pass, which gets you into six attractions that aren’t included in the free admission. The Adventure Pass is well worth the $12.95 fee, which is less than admission at other major zoos. We had planned to spend only the morning at the zoo. But with all that the Adventure Pass offers, we ended up staying all day.