My son is 3 months, so my favorite thing to do with him besides cuddle is get on the floor and show him his toys, sing crazy songs to make him laugh, and just watch him.
My daughter is 17, and most of the time way too cool to want to hang out with the likes of me

, but when she was little we would pack a picnic and go someplace to eat it. If we were going someplace that we could, we'd play ball or frisbee. If not, we'd lay on a blanket and look at the clouds. We would give hints as to what we thought they looked like and the other would guess (like "cloud" 20 questions). We would also make pretend we were on a cloud and we would explain to the other what we could see from up there. We used to like the park too, until .I got a huge wood splinter in my knee from climbing around in the fort.