I ride the MUPs here pretty much all the time, don't want to be hit by a car.
When approaching walkers I play it by ear, joggers who stay on their side I'll slow a little and pass with a single ring of my bell. Groups or aimless wanderers I ring several times, slow down and pass carefully, the same with other cyclists, it depends on how they ride. Zombies are the worst (My term for people wearing earbuds), I've surprised several (Walkers and cyclists) who are clueless that I'm there, no situational awareness whatsoever. I don't let it bother me though, I'm too happy riding my bike.
I've been thanked multiple times for using my bell, cven complimented on it a few times (Never heard "Nice Bell" before, must be my technique
...)
Oh, and I always say "Hi" or "Good Morning" or something like that, to pretty much everyone, whether they're coming or going...