My experience with pacelines in this type of ride is that they go flying past me and I wonder for a minute if they're enjoying the scenery or even noticing it at all, and then they're gone, off into the distance.

Most of the riders you see will probably be more casual. You might find yourself riding in a loose group of others who are about the same speed, and you can stick with them if you like them, or you can drop them or let them drop you.

I was thinking about doing the metric version of the St. Mary's century, but I will probably decide that at the last minute.