A company called Rail Explorers on the east coast of the US offers human powered “rail bike” rides on unused railway lines. This service is a fun way to experience the outdoors and get physical exercise. You can learn more about them here: https://www.railexplorers.net
Do you know of a unused railway line, near you where this service could be offered? If so, you could run a crowdfunding campaign where funders receive blocks of tickets to ride on the “rail bikes” once the service is up and running. This project idea depends on obtaining approval from the owners of the dormant or closed railway.