I expected much more in-fighting when I started this thread, it's refreshing to see that not be the case. I'm not saying MUP's are a bad thing but there can be unexpected dangers on MUP's to the un-initiated and of course it depends on the MUP. I suppose in the grand scheme of things though, a collision with another cyclist or pedestrian will usually have a far better outcome than a collision with a car or truck. If one slows down and just enjoys the people watching on a busy MUP it's still fun. If you want to get somewhere quickly / keep a good pace, the MUPs I've ridden are not the place to do it.