Hmm.. I live in Rockford, right in your area. Nice windy roads out where we are, ehh.. not many. Usually just straight shot "block" roads. Straight, left or right. There is a stretch of CR-50 spanning from 55 in Rockford to CR-116 in Hamel that's nice and windy in some areas. Two stop signs in the way though. CR-50 and Town Hall Road (where the Greenfield Police Substation is) and CR-50 and CR-19 intersect. Past that heading East and that's where most of the fun begins until you hit the 30mph speed limit heading into Hamel by a church. Keep heading east on CR-50 and it'll eventually turn into CR-10/Bass Lake Road heading into Maple Grove.
Speaking of events, me and my buddies run this new car group focusing on holding events in MN called InCarNation Events, LLC. We're holding a cruise to BIR later this year (free of charge) and "ICN First Annual Garage Opener Car Show" happening in May this year.
Facebook link to ICN's page.