We have a "great" MUP path near the beach in Santa Barbara. I used to go there with my son to ride bikes but I would get so nervous he would hit someone that we stopped.

Technically it's the bike/skate/skateboard path and then the sidewalk runs parallel to it. Well what we end up with is people on rented bikes, rented bicycle carriage things that hold 4-8 people, tourists on skates, local skateboard rats going to the skatepark, joggers, dog's, every manner of pedestrian you can imagine walking 6-8 abreast, covering both lanes. It's an accident waiting to happen. Personally I think the pedestrians should stay on the sidewalk (which is always less crowded) and allow the cyclist to use the bike lane.