Hawaii vs San Francisco

Hawaii is the ultimate winter escape for Americans: no passport, no currency exchange and 80°F (27°C) days while the mainland shivers. Choosing an island is the first decision. Oahu is the energetic hub, with Waikiki's beach scene, the moving USS Arizona Memorial at Pearl Harbor, the Diamond Head crater hike and the North Shore, where winter swells send 30-foot waves rolling into Waimea Bay and the Banzai Pipeline. The Big Island is raw and vast, with active volcanoes at Hawaii Volcanoes National Park, night snorkeling with giant manta rays off Kona and stargazing near the summit of Mauna Kea. Maui, with the Road to Hana and Haleakala sunrise, is the romantic middle ground and deserves its own trip. This 7-day plan pairs 3 nights on Oahu with 4 nights on the Big Island, linked by a short inter-island flight of about 45 minutes. Book the key reservations early: Pearl Harbor's USS Arizona Memorial program, Diamond Head entry for non-residents, and a manta ray tour. Pack a light jacket for volcano evenings, mineral reef-safe sunscreen for the reefs, and plenty of patience for traffic in Honolulu.

San Francisco packs world-famous sights into a compact, hilly peninsula wrapped in fog and bay views. Ride a clanging cable car up Nob Hill, then drop toward the water for sourdough bread bowls of clam chowder at Fisherman's Wharf. Book Alcatraz well ahead, because the ferry to the former prison island and its gripping audio tour sell out weeks in advance. Walk or bike across the Golden Gate Bridge, coast downhill into Sausalito for seafood by the bay and ride the ferry home past the skyline. Give a full day to wine country, sipping Cabernet in Napa Valley or Pinot Noir in laid-back Sonoma, and save a morning for the towering coast redwoods of Muir Woods, where parking or shuttle reservations are required, or swap in the cliffs and beaches of Half Moon Bay. The city itself rewards slow wandering: dim sum in Chinatown, espresso in North Beach, murals in the Mission and sunset at Ocean Beach. Pack layers whatever the month, since summer fog can drop temperatures into the 50s while the sun shines a few miles inland, and wear comfortable shoes for the steep hills. September and October usually bring the warmest, clearest days of the year.