I feel like someone should develop "Vampire routing" mode more widely. We need trees and building heights recorded more comprehensively in #OpenStreetMap
https://sosm.ch/the-coolest-way-to-find-shady-paths-vampire-routing-on-routing-osm-ch/
https://sosm.ch/the-coolest-way-to-find-shady-paths-vampire-routing-on-routing-osm-ch/