For my solution, I created an application entitled Lantern in which users can participate in a series of scavenger / clues hunts around a city to take them to various unique destinations based on their interests. Participants can learn about the places they are taken to and choose how much time to spend there. Once they solve the riddle, they get the clue for the next spot.
Because so many travellers are without wifi or internet when abroad, Lantern hunts can be downloaded and used offline as well. Additionally, you can join up with strangers interested in completing the same hunts as you to meet new people while travelling.