Harborwalk and Historic Seaport at Key West Bight
Along the waterfront from Front St. to Grinnell St.
If you only have time visit one part of town, the Historic Seaport area is the place I always suggest. The Key West Harbor (Bight) was once a working waterfront filled with shrimp boats and commercial fisherman. Today, it's a renewed area filled with restaurants, shops, schooners and party boats, just leaving or returning from on-the-water adventures. You can book fishing charters with captains, schedule a sunset sail on an historic schooner or find a full-day off shore adventure on a giant catamaran.
Just walking along the water taking in the sights in and on the water and stepping into some of the many dining and imbibing spots that line the way is a great way to spend a day, or ten.