This is just a thought, any feedback would be appreciated!
My idea is about a nontransferable token that can be obtained by traveling. We can gather the needed information about the main attractions (in tourist areas from the people in the area) to make these tokens. The tokens will show where you have traveled, and you can complete achievements. You can also challenge your friends to travel as well or go with them for adventure. To make the tokens unique they can have dates and times on them as well as some emblem on the back such as the persons avatar or an option of the sun’s position in the sky or the lunar phase at the time.