Mexico City vs San Francisco

One of the largest cities in the Americas, Mexico City sits atop the ruins of the Aztec capital Tenochtitlan, with the Templo Mayor excavation visible steps from the colonial-era Zócalo. World-class museums, a thriving taco and street food scene, and leafy neighbourhoods like Roma and Condesa have made the city one of the most talked-about food and culture destinations in the region.

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.