Are they all wanting to stay together the whole time? If so, some will want to do more than yall are doing, while others will want to take breaks. We went with friends that CONSTANTLY wanted to stop and we missed out on so many things. It literally caused so much strife that it ruined the trip. I say split the group. Plan a certain meal and maybe 1 or 2 fastpasses where you all meet up, then talk can break out into groups with similar places.