SeanKroll
Treehouser
Willow
Around here I am not a fan of Russian olive, acacia, hawthorns, and spruce in general can itch me up. Sycamores when in season can have me hacking until I throw up while chipping. Cottonweeds can have those huge reservoirs of poplar piss in them that's gross. Or the worst. Any tree in someone's yard with dogshit around it/in the work zone.
No child can help but grab a armful if they're in reach and voila! Instant swing. Break a few off for whipping your buddies. Then you can use more fronds to tie them up with once you've subdued them!
This is one of those exotic tree species that grows here you don't want to get anywhere close to, except by being upwind and pruning with a polesaw pruner!
https://en.m.wikipedia.org/wiki/Lagunaria
Innocuous little trees all benign n friendly lookin, but the underside of the leaves shed fiberglass like hairs that'll drive yu crazy itching, hence the name cow itch tree.t in some pretty cruel pranks on the job by collectin hairs in a bag and distributin them where wise guy antagonists frequent.
Respirators are useful for chipping dead stuff, stump cuts (or use a blower), pollen...
Straight grained hard leaner trees, locals being red alder and big Leaf Maple