The South Padre Island outpost of the Jimmy Buffett-branded LandShark Bar and Grill bringing cold LandShark Lagers, frozen margaritas, and the Margaritaville tropical formula to the southernmost beach bar town in the continental United States. South Padre’s warm Gulf water, reliable sunshine, and the particular tropical energy of the Texas-Mexico border coast make LandShark’s formula feel genuinely appropriate here: cold beer and the Gulf of Mexico in view is its own argument.