You will absolutely LOVE Door Cty - The Cape Cod of the Midwest - We try to get up there a couple times every year..
Our favorite is Peninsula SP - but you'd be hard pressed to get a spot there this late in the game.. and you'll probably want to have FHU if you're going to be in the area for a week.
Egg Harbor Campground & RV Resort
is very nice, I believe they also have a pool, which could be nice at the end of July. It is in a good location, right between Egg Harbor and Fish Creek, and very central to all points of Door Cty...
Hy-Land Court RV Park & Campground
is also very nice. We've stayed there a couple times and have been very happy with the accommodations - it may not have all the amenities of a big resort, but we liked the quite atmosphere..
Rustic Timbers Door County Campground
is a nice place too.. its just south of Egg Harbor and had everything you'll need for the weeks stay.. Again, we've stayed here and have been happy.. They too, have a pool and other amenities that will occupy your down time.
Harbor Village Campground & Water Park
is exactly what it sounds like.. this will be a park long on family/kid activities and action - If you're gonna be in the area with kids, this may be the place for you.. if it's just the two of you, maybe not.. I have never actually stayed at this place, but have driven thru it a couple times and it looks to be a nice place, well kept and bustling with action.
There are other places to stay, but these are the ones I have direct experience with..
Also.. if you're in the area, don't forget to go up to Sister Bay and check out Al Johnson's Swedish Restaurant and the goats on the roof (yes, they have goats on the roof) - it is a historical place in Door Cty and no visit would be complete without going and checking it out -
Also, if you're a star-gazer - you could take your telescope up to Newport SP - it's Wisconsin's first "dark-sky" park.
I would suggest checking out this site --> https://www.doorcounty.com/
to check out all that is going on the week you decide to visit.
Good luck and have fun !!