The Hart Montague Trail connects a series of small towns in west Michigan on a former railroad right-of-way. It's about two hours north of Kalamazoo. The trail runs 22 miles from Hart to Montague.
We started at the Hart trailhead (a mile from downtown Hart, on Polk Road right next to Hansen's Grocer) and rode to Shelby, about 8 miles each way. The trail passed orchards, woods, and fields of asparagus. Like most rail-trails, it offered easy riding without steep hills. On Labor Day weekend, it was very popular, although not too crowded. It made a very nice ride.
The trailheads at both Hart & Shelby had plenty of parking, several picnic tables, exercise stations, and information signs. The "Get Off The Couch" website has detailed information on the whole trail.
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.