We just returned on Saturday, so what to and what not pack per person is still on my mind. I can only speak for the Springtime and a 6-day trip, so this is what I'd pack if I could do it all over again! And mixing/matching clothes are very helpful, as well.
One sweatshirt for play
One nice sweater, outfit and comfy dress shoes for dinners, shows, etc.
Light raincoats or rain ponchos
One hat per person (scotchguard it, if possible!)
At least one pair each: sneakers, sandals made for walking
One set of jewelry (earrings, neclace, etc.)
One pair pants, 3 pair shorts/capris, one sundress (for DD)
One l-s shirt, 3-4 ss shirts
One warm jacket for those cooler days & evenings
Swimsuit (t-shirt can double as a coverup)
We wore some things twice, but if I had the chance to do it all over again, I would've used the laundry service, no matter the cost (I didn't have time to do laundry), just to have less to pack when leaving. I'd rather have spent more time playing than packing!