So I just stumbled across this post from May 23rd, about COMBO possibly building trails along the Olentangy Bikeway. Back when I was at OSU in the early '90s, before the paved bikeway and any of the bridges went in, there were lots of nice "outlaw" trails - and a skills park - hidden along both sides of the river. If anybody involved with the project wants some help rediscovering any of them, PM me.

Here's an old GPS track I made of the Kenny Park trail, which is mostly impassible due to honeysuckle now: