I go on an annual ladies trip to
Disneyland each year, and there are several that like to plan in our group. Each day we all meet up for a group photo, a ride together, and then meals are set up and people choose which ones they want to go to. It's a lot of fun. Maybe you can do a modified version, where instead of each day, you do a group picture on one day. You can set up one meal a day that anyone can attend. If it's a place where you do mobile ordering, you can set up ahead of time where and what time everyone can meet.
Even with my own family (5-6), we always plan ahead, or, I plan ahead, and put together a calendar in PowerPoint or Excel with what we're going to do each day. We usually do a zoom meeting and discuss if there are any preferences and go from there. I usually give options, and if they don't know then I make the decision, and everyone goes along with it. Then I email the PowerPoint to everyone (also print it, lol), and we have the itinerary in our phones
I would not recommend figuring it out as you go. You'll end up wasting so much time with no expectations set up ahead of time. The ones that want to wing it can wing it and they'll know that they can meet up with the group at certain times: meals, parades/shows/nighttime fireworks, etc., or picture.
One of the group pics we took on our last trip
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In 2019, there were 10 of us that went on a pretty big trip. Different groups had different priorities, and we decided before the trip that no one was obligated to be with the group. We picked a couple of excursions together and a few meals. It was so stress-free - wonderful trip.