Paul Barnard
I ride the levee everyday-literally everyday.
As you found out-plenty of walkers up there-and they really aren't aware of any etiquette- not meaness just ignorance.
Walkers just wander about- just as you describe. Some slow bike riders ride side by side taking up the entire path-both lanes.It isn't meaness-just ignorance.Not the "this is my road get the F off-" you occasionally get from a car driver-just unaware.
I actually ride the levee(not the path much)-doing 10 climbs upriver then 10 downriver -at a gentle angle angling across 70 yards or so to reach the top.
It is a nice path- frequently there is a little breeze-fair amount of wildlife when the river is up-nice ride,pretty safe in daytime-maybe not so great in some areas at night.Levee cops go by every 30 minutes during the day.
Charlie