One of our favorite summer events was Taste of Cincinnati, where they block off a section of downtown and fill it with vendors. We got balloon hats, Irish nachos, and the best gyro I've ever tasted. Afterwards we walked down to the bridge that was the pattern for the Brooklyn bridge, crossed into Kentucky, and came back. It was hotter than snot, so we stopped in Smale Riverfront Park to play in the fountains. That became another favorite spot.