Sometimes I get sick of brambles on the local bike lane I use a ton, and take a pair of battery electric trimmers to cut back grasses and brambles that grow over the lanes. But I’m curious if cities have actual programs with access to better tools. Working on bike lanes is super satisfying, but I’d love to do it with a group.
I have helped dig and repair single track. If there is an obstruction, especially one that might bite some poor commuter at night, I remove it if I am able.
Where I ride now, the ocean overtopping the trail is the biggest issue. That takes heavy machinery to fix.