We have gone with a group of 18 family members, this year will be 21. We have a promise to each other that we are all on vacation and are not committed to do anything together although we go to the parks the same days but some of us have kids the same age and others don't so we sometimes meet up throughout. We also eat together, not fancy a couple of times but again the best grand gathering is a non stressful one because we are all on vacation.