Here are the maps. (I didn't read stickies so if I'm not allowed to post this, I apologize)
First map just shows where the Gb4 were found in relation to Gilgo: this is the area I'm concentrating on. The area where it says Gilgo is actually marking off the parking lot for the regular beach goers. You must park your car and walk under the tunnel to cross the parkway to get tho the beach side.
Second map is going to show the bodies in relation to the entrance to the 4wd beach. if you note where the two lanes sort of merge together, you cannot simply stop and cross over there and make a turn into the beach. You actually need to drive past the parking lot (in map one) and go into the turn about.
Third map shows the first turn about after the dump site. Whether or not the killer frequented the beach or not, there is only two ways to get back to the mainland. It's either drive further west and cross the other bridge (going completely out of the way) or turn around right here and go back over the same bridge you crossed to get there.
To me, the killer did exactly that. It just wouldn't make sense that he drove all the way down to the jones beach bridge and then back on another highway. It's possible but not sensible. If you google earth or google map the area and take the highway all the way down to Jones Beach, you will see that there are plenty more areas that he could've dumped the bodies. Areas, where there's even less of a chance of it being found. He dumped at Gilgo for a reason. Either Gilgo holds some significance to him (i.e., it's a place he spent a lot of time at or possibly had a bad experience at, or he was doing it because it was the first feasible spot after the Oak Beach houses but before the turn about to go back to the Robert Moses bridge.
At night, Ocean Parkway is basically a ghost town. Years ago my ex-BF and I rode his motorcycle down there at night during the summer. We were the only two people on the road. We crossed both sets of bridges and when we got to the other side, we were greeted by a cop who told us we weren't allowed down there. We the. There's really no reason to be on the ocean parkway at night unless you're a resident of oak beach, or one of the other homes on the strip (which there isn't many) or you are going to one of the night fishing/4wd beaches. Other than that the occasional motorist mag just be taking a ride down that way for the hell of it. Just to have a peaceful ride and be the only person on the road.
Hope I helped make sense of some of the land for you guys.