Whether you are a beginner or a experienced golfer, Randall's Island is an excellent and affordable place to practice your swing. There is also a putting green, batting cages, miniature golf, a wifi lounge, a beer garden, and a well stocked pro shop. You can even play ping pong or foosball. They have a number of golf professionals on staff as well if you are interested in instruction.
The range can be reached by car, by going over the RFK Bridge and following the signs to Randall's Island. There is also a MTA bus and a shuttle bus which leaves from the upper east side of Manhattan. For directions, go to: http://www.randallsislandgolfcenter.com/index.php?option=com_content&view=article&id=40&Itemid=53. For those that want to take the MTA Bus from Manhattan, I suggest you meetup with your fellow golfers and travel over together.