For the Poconos, Jack Frost/Big Boulder, Camelback, and Blue are good; I've never been to Elk.
Definitely check out JFBB. You might really like Jack Frost for cruising groomers, but they are only open during the day. When JF closes, your pass gets you onto Big Boulder for night. Or you could just get a night pass for Boulder.
Boulder is more park oriented. Still a fun mountain, even if you don't ride park, but the runs are pretty short. It's a great place to learn park if you ever wanted. If you're a beginner, you might not mind the short runs.
Keep an eye on the Regional section here, too, for any meet ups in the area.