We did a group tour with members of our cycling club. We got to meet and know people we didn't normally ride with (much faster, racier people). We were at the back most of the tour however we were aware when we were holding the group up. For example we got on the sag wagoin when we knew we weren't going to make the lunch stop. I think you need to go on rides with reasonable distances (ours was 120km, 150km and 45km) over three days. That way you won't get ultra slow riders. And at night we were too tired to get drunk or get too annoying. We would have a drink, have dinner and then off to bed- too tired for anything else.