While Trinidad booms with industry and parties all night, tiny Tobago (just 42km across) slouches in a deck chair with a Caribe in hand watching its crystalline waters shimmer in the sun. Though Tobago is proud of its rainforests, fantastic dive sites, stunning aquamarine bays and nature reserves, it’s OK with not being mentioned in a Beach Boys song. It accepts its tourists without vigor, but rather with languor, and allows them to choose between plush oceanside hotels or tiny…