Sugarloaf Lake in Portage, just south of Kalamazoo, is a reasonably large lake for paddling and has a substantial amount of undeveloped shoreline (protected as part of the Gourdneck State Game Area). The southwest shore does have several houses. A public boat launch, off Shaver Road, provides access and parking.
A winding channel connects to Little Sugarloaf Lake. Little Sugarloaf appears more developed, with homes and docks along one shore and US-131 visible along the other shore.
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.