The tank is almost empty. And there are only a few miles left till you hit that long, winding southbound stretch of one-lane Overseas Highway with no gas, food, or beverages. It's a treacherous route along which the reckless road tripper could easily get stranded, go hungry, or even die of thirst while surrounded by a trillion gallons of salty sea. So you yank the wheel, pulling a U-turn into the RaceTrac truck-stop parking lot with plans for some unleaded, beef jerky, and ten liters of grape Gatorade. But that's when you spot Sam's Hideaway, with its placards that read, "Cocktails," "Cold Beer," and "The Oldest Southernmost Tavern on the Mainland USA." Forget dehydrated meat and purple drink. This bar's got cold $2.50 Budweiser and free hot dogs on Sundays. However, the strongest sign that Sam's just might be paradise: a painting above the doorway depicting a fanciful Florida landscape in which two dolphins can be seen leaping out of cresting waves and over a frosty, overflowing mug. So why risk crossing causeways and island chains? Perhaps this dive was always meant to be your final destination.