Hi skiers, Paragon Sports organize day skiing trips to Hunter Mountain in the Catskills leaving from their store just off Union square at 6.30am returning at around 7.30pm.
The cost is very reasonable, $70.00 for transportation and day lift ticket plus $19.99 equipment rental packages, skis, boots & poles. (Rental requires a visit to the store a few days in advance or you can of course rent equipment at the mountain).
I haven't been to Hunter Mountain but it appears to have a decent variety of trails.
I think it would be fun to get a group together and go. They also do trips on Saturdays and Wednesdays.
If you are interested here are the links for Paragon and Hunter Mountain.