13. Teach them how to change a flat tire. It might not be the most fun activity in the whole world, but they'll definitely thank you later!
14. Take a photography class.
15. Introduce them to games like chess or backgammon.
16. Volunteer for a day. Connect with a friend's parent and make a day out of it. Try the local soup kitchen or an animal shelter.
17. Take a stab at geocaching. Yes, gigantic scavenger hunts exist — and your tween will be completely obsessed with them.
18. Hit the spa, because a good manicure or massage always leads to chitchat.