We have a gorgeous MUP through Seattle that hugs a lot of coastline and goes by some lovely parks. The most congested part is divided into a bike path and a pedestrian path. They're very clearly labeled bike/foot paths. There are too many people with strollers and dogs on retractable leashes and groups of 10 walking shoulder to shoulder on the bike path. Even the runners use the bike path instead.

And then there's a hilly MUP on the south end with great views and switchbacks, and nobody ever uses it. I take that one every time, have it all to myself and enjoy better scenery than the nearby neighborhood roads.