The casino at Hinckley has trailer sites available. It's about 1.5 hours out of Mpls. Just keep you money in your pocket :)
Otherwise there's a state park at Taylors Falls about 45 minutes north. But given the holiday weekend it might be tough finding a vacancy where ever you go.
Classic Freestanding Rack
Kindle / iPad Cases
1 Canoe/Kayak Trailer