We only stay at BWV and I wouldn't try this at OKW, the rooms are just too small there. You can fit 16 in a BWV 2 bedroom (plus 1 child under 3 in the crib) and this is how: 3 on the king bed, 1 each in a twin aerobed on either side of the king bed, 1 in the bathtub, 2 on the pull out in the livingroom, 2 more on aerobeds in the livingroom/entry area, 1 in the kitchen, 4 in the beds on the 2nd bedroom side, one in an aerobed between the beds and a baby in a crib near the bathroom in the second bedroom.
If any of those people are teenagers who are in love, you can fit a lot more, but don't be surprised if you end up with some "little souveniers" at the end. Oh, and while you're there, make sure to steal extra TP and towels from the housekeeping cart, and make sure you all use the pool and take up as many pool chairs as possible... that's the only way to get your money's worth.