A driving tour of Tobago, from Scarborough to Charlotteville and back, can be done in about four hours, but you'd never want to undertake this spectacular, and very hilly, ride in that time. The switchbacks can make you wish you had motion-sickness pills (take some along if you're prone). Plan to spend at least one night at the Speyside end of the island, and give yourself a chance to enjoy this largely untouched country and seaside at leisure.