I'd thought the same, especially after discovering the whole Melody Lane thing. That it is on the Bing map, and seems to be a clear road, is still fascinating to me. I hope my pics demonstrate why.
The undergrowth on that path/lane is not so much that you couldn't ride down in there, but, honestly, it didn't look inviting to even walk thru, much less ride, until we got several yards in and it began to clear a bit. The real problem is that it simply dead-ends. It doesn't really go all the way to the lake, like to put a boat in, and it doesn't really go all the way to the trail. I took pics of the trail from there, and the fence keeps you away. If you followed that path back hoping to get on the trail, you'd be disappointed and forced to turn back or "bushwhack" through some serious undergrowth and woods to the east, along the fence until it ended and you could step out onto the trail. It would be difficult to walk from that path to the trail, especially if you had a bike. No way could you ride around the fence. Even tossing two bikes over the fence there would be difficult, I would think. The fence is like 8 ft tall.