The safe and comfortable boulevard along the Slotervart canal in Amsterdam that I frequently ride along into the city is not only lined with trees, but there are also lines of trees between the bike lanes and the roads on both sides, and separate dog walking paths and park benches in the trees between the bike lane and the canal, and big roundabouts with outer bike lanes at intersections! So cars don't mix with bikes, and bikes don't mix with pedestrians and dogs (and their poop). It's a really pleasant, stress reducing, smooth, green, cool, shady ride.

https://www.google.com/maps/@52.3495859,4.8053688,3a,75y,74....