The Lunken Airport Bike Path offers a 5-mile loop around Cincinnati's municipal Lunken Airport. Much of the trail sits atop the levee that protects the airport from flooding of the Little Miami River. The paved path is wide and affords many nice views of the airport for plane spotters. You also get nice views of the river in places.
The pathway connects to the Ohio River Trail at Wilmer Avenue, which follows the Ohio River into downtown Cincinnati. Both trails are part of the expansive Ohio to Erie Trail, a trail network which will stretch all the way across the state from Cincinnati, through Columbus, to Cleveland, a distance of 320 miles.
North of the airport, you can also pick up the Armleder Park Trail, which loops through its namesake park. The 238-acre park offers hiking trails, a playground, picnic shelters, recreational fields, and an off-leash dog park.
To park, take US Route 50 (historic Columbia Parkway and Eastern Avenue) to Ohio Route 125 (Beechmont Avenue) and turn right. Park by the driving range on the left side of the road.