16 Reasons to Explore St. Louis
Saint Louis Zoo
Lush landscaping makes the top-notch Saint Louis Zoo as pleasant as it is popular (and general admission is free!). Six sections encompass a wide range of environments from the sub-Antarctic to tropical rainforests. Even if you don't come with the kids, definitely spring for the sea lion show tickets ($3); the show is worth it. Also popular: The Penguin & Puffin Coast exhibit (left) and the 10-acre River's Edge, which winds through wildlife from four continents (314/781-0900; stlzoo.org).