I think optional marriage is a very good idea. If this was added in VV2, then what about family activites, such as a picnic, or simply relaxing together, as someone else mentioned.

What about, on the detail screen, it could state if the vilager was married, and, if they were, who to. Also it could name any children the villager had. Also, once two villagers were married, they could be given a surname.

I am all for marriage and families in VV2!