Cephalonia , Greece . Catalina Island wins TripAdvisor best island award for second year running . Scotland 's Harris and Lewis is new , at no . 5 . Alaska , with its wild ponies , and San Juan island among U.S. top 10 .
Catalina Island wins TripAdvisor best island award for second year running . Scotland 's Harris and Lewis is new , at no . 5 . Alaska , with its wild ponies , and San Juan island among U.S. top 10 .