"Stamp rallies" in Japan are so common that they invented their own pseudo-English word for them. The OG is the Shikoku 88 Temple Pilgrimage, which requires you to collect stamps from 88 different temples, preferably by walking 1200 km:
> Although there's no prize or verifying authority for completion.
And that solves many problems stated in the article. Rewards are tricky and create a willingness to optimize on how to obtain the reward instead of enjoying the experience.
https://en.wikipedia.org/wiki/Shikoku_Pilgrimage
Although there's no prize or verifying authority for completion.