Ok, so far here are a few choices: Opinions, comments...
http://www.valhallacampground.com/
This one is $33.00 per night/4 people per site per night. Sites all have water and electric, picnic tables and firepots. There is a swim beach. This is in Slayton, MN.
http://www.shadyoakscampground.org/
This one I have to call for prices and it is in Garden City, MN. The sites would be on the river though.
http://www.dunrominpark.com/
This one is in Caledonia, MN. There is a creek that runs through. It is 261.99 for the two nights for up to 20 people. This is a group area where we just put our tents and enjoy. She did mention they strickly enforce the quiet time after 11 pm.
http://www.camppla-mor.com/
This one in on the Mississippi River near Winona. We have a large grassy area near the shelter of our river side campground that works well for larger groups. There would be room for at least six tents. There is water and limited power available at the shelter. The cost is $25 per tent and covers 2 adults. Additional people over 10 years old are $3 each.**This might be the one you are looking for more. This one also has pontoon rental and many activities.
That is who has responded so far. Tell me what you think or I will pick one.

I am getting pumped already!!!!!!!!!!!!!!