Portage Creek Bicentennial Park is a paved trail hidden behind Westnedge Ave, Kalamazoo's main commercial strip. It's a popular spot for biking, rollerblading, and strolling. Parking is available at the Portage Library, Celery Flats Interpretive Center (Garden Lane), Milham Avenue, and Kilgore Road. It's the centerpiece of Portage's bikeways.
Canoes and kayaks can be rented at the Celery Flats livery on summer weekends. [2011 update: budget problems eliminated regular rental program; group rentals, by reservation, may be available.]
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.