…not an original one, but might be interesting.

In the old days when Shepherd Neame liked owning local pubs, they issued cards and every time you visited one of their pubs you had it stamped, with a prize for completing it.

There are maybe 25 pubs walkable in my town. Get as many local pubs as possible on board. Would need a sponsor to provide prizes such as a T-shirt; maybe a local brewery wanting to advertise.

If you completed it, along with your prize you get another card with another couple of dozen pubs reachable by public transport, and another prize.

Probably more reasons it wouldn’t work than would. But might be a small boost to the local pub trade.