My favorite beaches in Vieques are Blue Beach, Navio and Silver Beach :)
Five things in Vieques I can't live without are the pristine beaches (obviously!), grabbing lunch at the Sol Food truck and heading to the beach, sunset by the pool with a cold drink in hand, amazing dinners especially at El Quenepo and Next Course, and hiking down the arroyo to Black Sand Beach.
Enjoy Puerto Rico!!!