MORNING See the Napali Coast's 4,000-foot-high cliffs and 14-mile-long Waimea Canyon (left)—a mini version of the Grand Canyon—on another helicopter adventure; Island Helicopters.
AFTERNOON Ginger-lychee caipiroskas by the pool, anyone?
EVENING Break out your best dress for the St. Regis's Kauai Grill, which has dramatic Makana Mountain views. It's Jean-Georges Vongerichten's restaurant, so expect haute cuisine, like soy-glazed short ribs with green papaya–jalapeño puree. Ask the sommelier for a bottle of wine that's $10 more than you usually spend—and settle into a serious discussion about your first-anniversary return trip.