First pic is standing on the west side of the pump house, looking back towards the spot where the bikes were found. Pump on that jetty is very loud here. You can tell someone has cut this back recently, maybe this past spring, as there are cut branches and trees here. I remember this driveway as being almost completely hidden, so I believe this has all been cleared away, probably when they drained the lake in the last couple years. I believe you can barely make out a vehicle parked on the trail, to the right, which would be right near the jetty. We are also probably due north of where the fence ends on the lake side of the trail.
Second pic, a couple steps right of the last, facing southwest, shows the tire tracks. They are barely visible in this pic. They are not worn tracks, more like crushed undergrowth indicating a vehicle had very recently driven back there. The almost purplish flower would be directly between the tracks. I had to look twice to see them, but they became very obvious once I noticed them, and they went back deep towards the lake/fence. I didn't follow them, as it was obvious LE didn't want ppl back there, and there were several of them in my immediate vicinity.