There was a video game out for the PC a couple of years ago called Grand Prix Legends. It was a racing sim where you were a participant in the 1967 Formula One season. These maps are all part of that game.
Even still that list of tracks brough back some memories for me. Roosevelt raceway you can still go on because it is abandoned - but you better bring an MX bike or a 4x4 with some lift. I had a lot of fun practicing for MX races on that track, and my buddy and I even climed the bleacher stairs with his bronco.
Bridgehampton is now a golf course but it was an awsome course in its day. Still techinically there it is closed to the public. In the 50's and 60's some of the best sports car racers battled it out there. I used to go to Bob Grossman's westhampton classic car dealership to hear stories of factory 50's corvettes swapping paint with devlins and MGs. The first and only TT I ever competed in was in 1996 at that track, and I did it on a stock 1986 ninja 1000R (the bike my pops still owns). Considering that this was still when the original Orient Express was builkding 200mph hyper bikes out of Orient Point (15 minutes away from bridgehampton), I got my ass handed to me. I also spun the only porsche I ever drove there. It was a great track.