You're going to AC to gamble, so you might as well spend the extra few dollars and rent a car. It will be by far the easiest route. Philly International is convenientaly close to the Walt Whitman bridge which you will be going over. That turns into Rt. 42 which turns into the AC Expressway. No toll going over the bridge to NJ ($3 coming back to PA), you'll pay $2 for the AC Expressway both ways. Taking a car, depending on how fast you drive, you can get from Philly Int to AC in 45 min to an hour...unless of course there is congestion on 42 which happens from time to time.