I ride the local MUP about twice a week because I can get to it in a 5 minute ride from my house. It is frequently as busy as any MUP anywhere at certain times. When the parents are out with their little kids or pets I ride very slowly approaching them. The little kids are often visably delighted to be out and I will almost say something to them such as "Nice bike".

One time I was on longer ride on a back road in the early AM and met a woman pushing a baby carriage with a 5 yo boy on a bike coming the other way. The boy was waving hello vigorously so I turned around and road with him for a minute and told him I thought he had a very nice bike. He sure looked proud. I think cyclists should stick together and make friends of other cyclists and their moms.