For most people the word “vacation” means spending long hours on the beach under the shining sun, entertaining at a club on a fashionable island in the evening, or letting the “all inclusive” of a convenient hotel near the beach spoil you. But there are other people who prefer to spend their holiday traveling under a volunteer program and caring for seals, turtles, for the residents of a slum in Rio de Janeiro or build a school in Ghana in the summer.