Florida Keys vs Yellowstone and Grand Teton

The Florida Keys are America's most famous road trip island chain, a necklace of coral islands linked by the Overseas Highway as it hops 113 miles from Key Largo to Key West over 42 bridges and turquoise water. Starting from Miami, you can be snorkeling North America's only living coral barrier reef at John Pennekamp Coral Reef State Park within a couple of hours. Farther south, Islamorada is the sportfishing capital with tarpon feeding at the docks, Marathon has a sea turtle hospital and the soaring Seven Mile Bridge, and Bahia Honda State Park offers some of the best natural beaches in the Keys. The road ends in Key West, a colorful, easygoing town of conch houses, Hemingway's cats, and the nightly sunset celebration at Mallory Square. This plan covers the full Key Largo to Key West run in four days, then adds a day trip by ferry or seaplane to remote Dry Tortugas National Park and its giant brick fort. Navigate by the green mile markers, slow down in Key deer zones, eat plenty of fresh fish and key lime pie, and book Key West hotels early in winter.

Yellowstone and Grand Teton sit side by side in northwest Wyoming, linked by a short parkway, and together they make one of the great American road trips. Yellowstone, the world's first national park, holds more than half the planet's active geysers, including Old Faithful, plus the rainbow-colored Grand Prismatic Spring, the thundering Lower Falls of the Grand Canyon of the Yellowstone and terraced hot springs at Mammoth. It is also the best place in the Lower 48 to see big wildlife: bison herds in Hayden and Lamar valleys, elk, pronghorn, bears and, with patience and a spotting scope, wolves. Just south, Grand Teton's jagged peaks rise straight out of the valley floor above Jackson Lake and Jenny Lake, with sunsets that rival anything in the West. Fly into Jackson Hole or Bozeman, rent a car and plan on long but rewarding drives. Neither park uses timed entry, but in-park lodging books up months ahead, parking at Old Faithful and Grand Prismatic fills by late morning, and most of Yellowstone's roads close to cars from early November to late April, so summer and early fall are the main seasons.