Architect Renzo Piano's 2008 landmark LEED-certified green building houses 40,000 weird and wonderful animals in a four-story rainforest and split-level aquarium under a 'living roof' of California wildflowers. After the penguins nod off to sleep, the wild rumpus starts at kid's-only Academy Sleepovers ($109; ages five to 17, plus adult chaperones; 6pm to 8am including snack and breakfast) and over-21 NightLife Thursdays ($12), when rainforest-themed cocktails encourage strange mating rituals among shy internet daters.
