Personally, for me, the packing list that has been referred to ad nauseum is entirely overkill for myself and my sons travel style. Of the whole excel spreadsheet, we took MAYBE ten items that were pointed out on it, and even then, we STILL overpacked. Even with me forgetting my stack of shirts!

The list, for us: (this is for our 7 night Eastern coming up)
3 bathing suits (me)
3 bathing suits (kiddo)
4 pairs of pants/capris/skirts for dinner (me)
4 Pairs khaki pants for dinner (ds)
6 nice tops for dinner (me)
8 nice tops for dinner (kiddo, he tends to get dirty)
the usual daily toiletries, toothbrushes, toothpaste, deoderant, razor, mouthwash, contact solution, shampoo and conditioner, body wash (I usually have one set of these packed at all times, and replace the toothbrushes and razors as needed)
Any makeup necessary
Hairbrush/ curling iron/ hairspray
Sunscreen. 1 bottle for every 3 days (assuming they are the small bottles)
9 sets of undergarments (each, just in case of delays)
1 pair Flip flops (kiddo)
1 pair sport sandals (me)
1 Pair black shoes (kiddo)
1 pair black flats (me)
Travel in sneakers, t-shirts and jeans, carry on a sweatshirt each
Gallon size ziplocks (one for each 2 bathing suits)
And then whatever other junk i think i absoloutly need at the last minute. Remember, Pack what you think you need, then remove half.