Vieques

Measuring 21 miles long by 5 miles wide, Vieques is substantially bigger than Culebra and distinctly different in ambience. Though still a million metaphorical miles from the bright lights of the Puerto Rican mainland, the larger population here has meant more choice of accommodations, swankier restaurants and generally more buzz. It's renowned for its gorgeous beaches, semi-wild horses and unforgettable bioluminescent bay.