1) YES - you want to do SWGE. I’m not a SW person at all and can barely spell Batuu - but I enjoyed it quite a bit. Take advantage of the crazy long EEMHs if possible or go at night. Beautiful.
2) I did a group of 12 this summer, 8 adults and 4 children, ages 2-70’s. All of my prior travels had been just my family of four or just me and the kids, so this was WAY out of my comfort zone. I was the unofficial “planner” of the group. On our MK day, any thoughts I had on “staying together” quickly vanished - it just isn’t possible. I eventually took the attitude of “y’all are all adults and can figure this out.... we’ll meet at XX for fireworks or to eat... but otherwise you’re on your own!” We ended up split up quite a bit. Didn’t make for great group/family together time, but did make for keeping me sane.
GOOD LUCK!