Isla Culebra. Is the smallest of the Spanish Virgin Islands at just seven miles long and 3.5 miles wide. It exudes an entirely different vibe than its popular neighbor, Puerto Rico. The commonwealth to which Culebra technically belongs. Some 2,000 people call this U.S. territory home and adore Culebra’s quiet quirkiness. Culebra may be small and tranquil, but there are plenty of activities for nature lovers to keep visitors entertained with Culebra’s natural wonders. Hiking, snorkeling, scuba diving, kayaking, fishing, and sightseeing in awe-inspiring places.