If your ideal vacation involves sun, fun, and your four-legged friend by your side — the city of Marathon, Florida (home of the famed Dolphin Research Center) is calling! This unique slice of paradise in the middle of the Florida Keys is incredibly pet-friendly. With dog-friendly beaches, parks, boat rentals, and restaurants, you and your pup can play all day before retreating to your own private pet-friendly vacation rental. So, cancel the...