There is a river that you can canoe or kayak in
No there's not :(
No
No lake, but the Olentangy River runs past the park and is suitable for canoeing/kayaking.
There is no lake, but there is a clean river with many smaller creeks running through into it. Some are only good for getting your feet wet, at a couple spots it's deep enough for light swimming.
Thanks! Your answer is awaiting moderation.