The twin islands of Trinidad and Tobago are the Caribbean's odd couple. Trinidad is a densely populated, thriving island with a cosmopolitan population and strong regional influence. It's famous for hosting the loudest, wildest, most popular Carnival in the Caribbean. In contrast, 'little sister' Tobago is relaxed, slow-paced and largely undeveloped. There are claims Daniel Defoe had Tobago in mind when he wrote Robinson Crusoe, and travelers who enjoy its beaches, reefs and birdlife still tend to think of the island as the last undiscovered gem in the Caribbean. Located at the end of a 620-mi sweep of islands on the eastern boundary of the Caribbean, Trinidad and Tobago are just 6.8 mi and 19 mi off the coast of Venezuela. Despite this, there's surprisingly little South American influence - instead the country draws most strongly from its British, African and East Indian heritage.