There's two state parks in MN that look like possibilities. Great River Bluffs on the Mississippi River, and Beaver Creek Valley. Beaver Creek valley doesn't allow trout fishing after September. Both Parks have group campsites. For the seconed weekend in October GRB has all 4 available, while BCV has 2 out of 3 left. The park manager at BCV said the peak for fall colors is typically the 2nd or 3rd weekend in October, but with the dry summer could happen sooner. The costs are $50 per night for a group camp plus reservation fee. BCV group sites sound like there a little close together. Still waiting to hear back from GRB.