billboard advertising
"Remember how much FUN and exhilaration you felt while riding your bike when you were a child? Why not recapture those moments, and go for a bike ride? Take some time for yourself and just ride. You deserve it." - I think erecting billboards around the city with this encouragement (with or without an enticing picture to accompany it) would make my city a better place because either it could elicit a person actually go for a bike ride, resulting in a healthier, happier individual or it could elicit a purely mental and emotional response of happy nostalgia, resulting in a calmer, happier individual. This might also cause a shift of focus - regarding exercise as an personal treat for oneself instead for regarding exercise as Work. Perhaps drivers might also be a little kinder to those riding in the bike lanes if they were reminded of the past joy they had when They rode bicycles. One could hope anyway.