The phrase "unsuspecting tourists" refers to people who are visiting a new place without any knowledge or awareness of potential dangers or scams that may exist there. Full definition
Nicky agrees to show her the ropes, and even invites her to join his team of hustlers about to descend on New Orleans where they plan to pickpocket plenty of unsuspecting tourists. (kamwilliams.com)
Criminals have been known to smuggle drugs anyway they can, including through the use of unsuspecting tourists, so be very careful to keep your bags and belongings with you at all times. (worldnomads.com)