4.

I had a party in the backyard.
My friends from preschool came, and my friends from swim & gym, and the neighbor friends.
We played beanbag toss. My mom made beanbags with each child's first initial sewn on.
I had lemon cake with lemon frosting.
At that birthday party, I charted out what type of cake I would have for every birthday in the imaginable future: 5, 6, and 7.

(I stuck to it.)