I bring black Birks, tan Birks, sneakers, and usually wear a pair of Birk clogs. I found myself wearing the Birk snadals last trip most of the time...I don't think I put on the sneakers more than once.
I do think it's good to have a couple of different pairs of shoes/sandals to change into during the course of the day. Usually what I do is wear one pair to the parks, then we come home, change for the evening, and I change shoes.