It can also depend heavily on the personality of the child.
If your little one is a little more outgoing and not severely attached, there's a kids club where you can drop them off.We met other couples in the lab during family time where they said their kids wouldn't come out of the kids club.
My four year old wouldn't leave our side, however we still had a great time. Plenty to do for families together. (Bingo, kite making, game shows, nightly theatre shows, movies, pools, movies @ the pool etc.)
There seems to be no sign of intelligent life anywhere.