My DD brought along her BFF for her Sweet Sixteen trip! They had a great time!
They had their own room, connected to ours. I allowed charging privileges on their Magic Bands, so they could eat whenever. Really they spent about 60 percent of the time with us, and 40 without us. It was their choice.
They loved BOG---we went once for lunch and once for supper
They did a bit of Disneybounding, especially on the night we went to
MNSSHP. (Too old/cool for real costumes)
Pool time!! Teen girls love working on their tans!
Lots, and lots and lots, and lots of pictures with the phones. Gotta keep a live feed on those twitter, yik yak, snapchat, etc. accounts. Seriously, they laughed so hard---it was a hoot! Loved seeing them act like kids again! And I do mean LOTS, lol!
My DH and I let them use our bands to ride a few favorites twice in a row. They thought that was a great perk!
We basically gave them a few rules for when we were apart. Mostly common sense and checking in occasionally. We let them set the agenda and pace for the day, since the trip was for DD.
DH and I enjoyed the couple time when the girls were off, since we've never been to WDW just the two of us---BONUS!