Start a run along the Tomahawk Creek Trail from here, heading north. The trail never makes you cross a road, and it's mostly tree-covered. (Essential in the summer!) Creek-adjacent, makes it easy to know where to turn.
Update: you can also start from the Leawood Aquatic Center and either run south to I Lan park, or north which takes you across the state line, for bragging rights.
Update: you can also start from the Leawood Aquatic Center and either run south to I Lan park, or north which takes you across the state line, for bragging rights.