Dog walkers on the MUP letting the leash block the way. Dogs that are not on a leash. Which is against city ordnance. Once passed a lady with a large size boxer that was not on a leash. The dog took chase, barking. The lady screamed at me to stop because, "He won't chase you if you stop". No ****.

People with young children that are not supervised closely enough to keep them from weaving/walking
/running back and forth across the path.

Drivers who think they are being polite, sitting at a stop sign and waving you to go ahead, so that they will then have to pass you on a narrow neighborhood street.