Joni at her most twee. Not one of my faves, I confess.
au contraire, I have to give this a BOS as it was probably the only song in the set I was actually listening to when I was 6. I later discovered that my folks had the Iron Butterfly LP, but I have no memory of hearing it as a child.
ETA: I guess it's not the only one, we certainly listened to all the S&G albums, including this one. An even bigger BOS as this song helped me survive the most oppressive parts of my adolescence.