If anyone's heading that way this weekend, I would be glad to bring my yak and explore some new water. I'm in North M'boro, so it's right in my backyard.
Fall creek boat ramp is one easy to access. From what I understand though don't leave anything valuable in your vehicle. It's in the middle of no where and I've heard of vehicles being broken into.
Fall Creek access is the closest to me from Lebanon. Usually not too crowded and fairly calm water away from ramp to the left. I usually stop there after work or slide down under the bridges on 840. Probably too steep for access by canoe under the bridges though.