I travel with a group of 11 every couple of years with the same age span. We have found the notecard system to work best for our group. Basically, I am the head planner. I poll each person traveling that is old enough to have an opinion to see what couple of things they absolutely, positively must do so that I can work it into the plan. Then I type up an itinerary (including set dining ressies and ressie numbers) and place it on notecards (one notecard/day/adult) so that everyone has the schedule at their fingertips and can plan their day. Our group really liked to start the day out together - we all would go to the same park together in the morning. We didn't really tour together too much - too many differing ages/interests - we might do a couple of rides together first thing and then split up until lunch. We always tried to eat lunch together. Afternoons, except for a couple of nights, was "on your own" time for each family. If we wanted to all go to the same park together, great... if someone wanted to go back to the pool and take a nap, no problem. We did schedule a couple of dinners when we would meet up too, but most times it was just lunch so that everyone had ample "free time". Basically, I just tried to plan one meal together for each day so that we could "catch up". I also highly recommend the Grand Gathering Experiences as a nice way to get together. We did the Fireworks Cruise with Cap't Hook/Smee and it was awesome!