Palm Beach...from downtown...over the intercoastal..onto palm beach...same can be said for miami
I had the same idea for Fort Lauderdale about 10 years ago: Sunrise Blvd to Beach down to las Olas recross the Intracoastal, up Las Olas and wind back to Sunrise....would nice but will happen when alligators fly
Hell, folks on the island only grudgingly allow people from West Palm to cross the bridge, so noisy racecars streaking past The Breakers are unlikely! The sight of an F1 car careening off Ocean Blvd. over the seawall into the Atlantic would harken back to the days when cars ended up in the harbor in Monaco though!
If not LasVegas I say Vancouver BC at least that'll give us a west coast & east coast race. Montreal is still on, right, or did Bernie nix that one too.