BIG SANDY LAKE in Aitkin County just about 10-15 miles North of McGregor on MN HWY 65 has Army Cor Campground on the NE corner with Tenting sites and Camper/RV sites. The South side (Entrance)Campground is on the Lake. Very clean with showers, etc, electric hook ups, docks for boats and etc. Family went there for years before we got the cabin up there. Still put the boat in there occasionally and fish the river also. The campground is located at the dam which leads into the ole Miss a sip! If the flow is right, there great shore fishing on the river side (just down stream from the river boatlaunch on the other side of the river or right below the dam. ( I have caught Muskies, Eyes, Northern, Smaillies, Perch, Rough Fish, Perch and Crappies all below the dam from shore). There are boat ramps to the river side and lake side. It has a swimming beach, playground, with the ability to tube out on the fairly large lake.
If you have any other questions feel free to pM me for more info on fishing!