For an idyllic fall afternoon, I'd recommend a hike in the bike & hike on the towpath, then stop nearby at Beckwith Orchards to pick up some fresh apples, cider and homemade jams or pastries, then stop in Riverside Wines near Kent for a glass of wine on the way home.
Beckwith has a really cute, unique selection of little gifts and foods. We browsed around the shop and picked up some apple cider, a few bags of apples from the orchard, apple pie mix, blackberry butter and (randomly) the best jarred queso I've ever had.
I only wish there were more encouraged outdoor things to do - like pick apples yourself in the orchard or walk in the pumpkin patch.