One of the most obvious career choices if you love to travel is to become a tour guide. In what other job can you spend your days exploring cities like Athens, Rome or London -- and get paid for it?
Every city that attracts tourists needs tour guides. Some guides work for a particular location (such as a museum), while others lead themed tours (like ghost tours or historical bus tours). If you're particularly good at your job, you can eventually work your way up to become a director or even owner of a tour company.
To be a tour guide, you not only need to know your city inside and out -- its history, culture and hidden secrets -- but you also need to relate well to people. You've got to make your tour group feel comfortable in a city that's unfamiliar to them. Depending on the type of tour, you may also need to help them handle small emergencies that arise, from getting medical care to finding lost luggage.
If you're planning to be a tour guide abroad, it helps to speak another language (or two, or three) and to have a solid education in the history and culture of the area.