Several guys I know live out that way and none have been impressed with the Powerline Park unless you are really into mud-bogging and have big tractor tires.
For reference, exit 100 on I-70 is right in the middle of Columbus and this place is exit 213. Going to guess it would be 3ish-hours from Lima.
A couple discussions about the place on the Ohio 4x4 board:
http://ohio4x4.fourwardmomentum.com/...ead.php?t=6475