I did this last year- all good advice so far! If you're staying onsite it's much easier to split up/meet up as you wish. We set expectations ahead of time,like who wanted to plan times together,and general itinerary. (that was me) The rest agreed ahead that was fine. I decided on a set amount of 'together time' each day,and got our group overlapping Fp's on that time period. (between park open-about noon daily) this worked fairly well, we all had fun,altho in retrospect I would have left a longer space in between fp 2&3 for a lunch break,then last fp,then split up or whatever.So I should have planned about 9-1:30 for our together time.
Anyway this worked well, on some days we all stuck together after that time block,on others we split up as desired,to do whatever.
This worked well for our group. Don't try to make everyone stick together all the time, that's too hard for a big group of varying ages.
We had a planned meet time and place in the park each morning,this worked well also. If on group was late for our first fp, that was ok, the rest of us just did the ride,and late group met after. Very chill.
Some plan a meal a day together,we didn't. In spite of that,we still had some meals together tho.
together time at the pools was our fave part of the trip!