Make simple kites together (or buy two). Pack a picnic with lemonade, finger sandwiches, and edible flowers.
A small herb garden, a potted flower, or a tree. Name it. Visit it on later dates to see it grow. 4 season dates
Build a blanket fort. Inside, watch cartoons or holiday specials you loved as kids. Eat cereal or grilled cheese. Make simple kites together (or buy two)