I'd say if your bringing the kids the flats may be the best place. Thats where we'll be at this year. I've camped at the finger dunes and its good for blocking the wind but you have to be careful of people coming up and over them and into your camp. Plus you have people running up and down them all night long. But no matter where you camp have a good time and be safe! some advice a friend gave me the first time I went out on a big weekend.....Watch out for everyone else, cause they're not watching out for you....... I know it doesnt hold true to everyone, but still good advise
And Welcome to the site!!!!