Hmmm....my son will do lots of things with me, maybe not lots, but more if I take his friends. Maybe the pay for a friend isn't such a far fetched idea. At this age friends seem as important as food and water/life and death. I have found if I give him enough advance notice and say "on this weekend we are going to (you fill in the blank). Or by this date "I want you to have done..." He will then work things in and plan for them. Or play the poor dad card! I have. Works pretty good when your desperate. Say, "Honey, on this date I am taking u to wherever your getting older and I need to spend a little time with you. You are always with your friends.
The good old guilt trip, lol.