If you have a love for new cities and old, you can equip yourself with everything there is to know about it. Put up ads in the paper stating how you can be a reliable tour guide, with information on everything tourists need to know about like the best restaurants, hang out spots, city highlights, shopping destinations and so on. Have a transportation of your own to accommodate your tourists so that you come off as more believable and someone they can rely on for a legit good time.