Fodor's Expert Review California Academy of Sciences

With its native plant–covered living roof, retractable ceiling, three-story rain forest, gigantic planetarium, living coral reef, and frolicking penguins, the California Academy of Sciences is one of the city's most spectacular treasures. Dramatically designed by Renzo Piano, it's an eco-friendly, energy-efficient adventure in biodiversity and green architecture. Moving away from a restrictive role as a museum that cataloged natural history, the academy these days is all about sustainability and the future, but the locally beloved dioramas in African Hall remain.

It's best to look at the academy's floor plan to design your visit before you arrive. Here's the quick version: head left from the entrance to the wooden walkway over otherworldly rays in the Philippine Coral Reef, then continue to the Swamp to see Claude, the famous albino alligator. Swing through African Hall and study the penguins, take the elevator up to the living roof, then return to the main floor and get in line to explore the Rainforests of the World. You'll end up below ground in the Amazonian Flooded Rainforest, where you can explore the academy's other aquarium exhibits. The popular adults-only NightLife event, held every Thursday evening, includes after-dark access to all exhibits, as well as special programming and a full bar. Considering the hefty price of admission, start early and take advantage of in-and-out privileges to take a break.