For the 1,800 bicyclists who used to travel to southern Minnesota every October to ride the Mankato River Ramble, memories of the picturesque ride endure: Stunning fall colors along the off-road wooded trails. A 40-foot waterfall and energy-boosting homemade snacks (peanut butter-oat balls, bumps on a log) at the Minneopa State Park rest stop. A warm small-town spirit, whatever the fall temps might bring. Best of all, flaky-crust pie from the Rapidan Dam Store (which has reopened in downtown ...