In mid-August, me and a buddy just showed up on a Tuesday around 2pm. We were on the green course by 2:30 as a walk on, and could have played the red course if we wanted to wait until 3. I thoroughly enjoyed the green course, but it was a little slow that day as there was a really slow group in front of us. They let us play through after the fourth hole, but we got tied up again at the 10th. After 5 hours we called it quits on the 17th tee. It was already getting pretty dark, and the group in front was taking their dandy ass time looking for their tee shots. I had enough and teed off in the middle of the fairway, just as they were getting back into their carts. The rest if my group decided to jump to the 18th so we could finish, but again there was a group in the fairway walking around looking for their balls, so we left. It was a shame not to finish as I was having a good round.
Bethpage is a beautiful place with an awesome clubhouse and patio. Go show up and play any course, you will not be disappointed. By the way, I got the NY rate without them even asking to see my license.