Genesee Waterways Center offers flatwater rowing, sculling, canoeing, and kayaking on the Genesee River and Erie Canal near Genesee Valley Park, and whitewater kayaking at the man-made course at Lock 32 Whitewater Kayaking Park. During the summer, you can take rowing or sculling lessons, and row in a group (it's fun!), and rent kayaks and canoes from GWC to paddle where you please on Rochester's many waterways.
For rowers, you can become a member of GWC, and either store your own boat and oars at their boathouse, or have unlimited use of their boats for an equipment usage fee—including their kayaks and canoes!