Things to do
Six honest picks. Not sixty.
From Wikipedia + OpenStreetMap. No affiliate links, no crowd bias.
Southernmost Point Buoy
The Southernmost Point Buoy is an anchored concrete buoy in Key West, Florida that claims to mark the southernmost point in the continental United States — though it is neither the true southernmost point of the continental US nor of Key West — and was established as a tourist attraction by the city on September 10, 1983. The large painted buoy is 18 feet (5.5 m) above sea level at the corner of South Street and Whitehead Street.
Wikipedia → Sand Key Light
Sand Key Light is a lighthouse 6 nautical miles southwest of Key West, Florida, between Sand Key Channel and Rock Key Channel, two of the channels into Key West, on a reef intermittently covered by sand. At times the key has been substantial enough to have trees, and in 1900 nine to twelve thousand terns nested on the island. At other times the island has been washed away completely. The light marks the southernmost point of the Hawk Channel passage along the Florida Keys.
Wikipedia → Key West Museum of Art and History at the Custom House
The Custom House and Old Post Office is a historic site located at 281 Front Street, Key West, Florida, United States. On September 20, 1973, it was added to the U.S. National Register of Historic Places.
Wikipedia → Mel Fisher Maritime Museum
The Mel Fisher Maritime Museum is located at 200 Greene Street, Key West, Florida. The museum contains an extensive collection of artifacts from 17th century shipwrecks, such as the Henrietta Marie, Nuestra Señora de Atocha and Santa Margarita. Also included are the shipwrecks and artifacts of The Santa Clara, a Conquistador-era galleon (1564), The Guerrero & Nimble. A rotating gallery exists on the second floor of the museum and is currently displaying an exhibit or artifacts belonging to Cuban Rafters, Balseros, who arrive to Key West in hand-crafted vessels. Terrestrial archaeological sites include The African Cemetery of Key West, located on Higgs Beach. The museum is named for founder Mel Fisher and was created as a 501(c)3 non-profit charity organization, thus Fisher's fortune is not financially linked to the museum. It is a museum, a lab, and a nationally recognized research facility.
Wikipedia → The Shops at Mallory Square
The U.S. Coast Guard Headquarters, Key West Station is a historic site in Key West, Florida. It is located at the northwest corner of the intersection of Front and Whitehead Streets. In 1973, it was added to the U.S. National Register of Historic Places.
Wikipedia → USCGC Ingham Maritime Museum
USCGC Ingham (WPG/WAGC/WHEC-35) is one of only two preserved Treasury-class United States Coast Guard Cutters. Originally Samuel D. Ingham, she was the fourth cutter to be named for Treasury Secretary Samuel D. Ingham. She was the most decorated vessel in the Coast Guard fleet and was the only cutter to ever be awarded two Presidential Unit Citations.
Wikipedia →