Sprawled across 250 acres northwest of the city is the world's largest marine park. Displays and shows feature dolphins, beluga whales, sea lions, seals and otters. The star is Shamu, a 2.5-ton orca who gracefully leaps and dives with human partners before as many as 4,500 spectators. Indo-Pacific fishes cavort in a simulated coral reef near North America's largest display of hammerhead sharks.