By Madeline Laguaite Malisse Haarl got a marriage proposal during a kayaking trip on the Chattahoochee River, and she and her fiancé started planning their wedding soon after. The couple envisioned a beautiful wedding in Asheville, N.C., this October. Now, Haarl, who lives in Atlanta, and her fiancé are still planning — but this time, for a backyard…