Google map of some of the parks and ski areas available for cross-country skiing in the downstate NY area (conditions permitting of course!). See the List of Touring Centers or Nearby Parks and Trails for additional info. Many parks and golf courses permit skiers in winter; check specifically or with some cross-country skier groups for suggestions.
Legend for the markers below. Touring centers are color-coded by extent of facilities. Park or club trails typically have the basics (a simple warming hut and maybe toilets); ‘rustic’ touring centers will often have a cottage or barn as a warming hut, and may have rentals and food. Regular touring centers are a step up in having the ‘tourist-friendly’ essentials of rentals and food, as well as a lodge. Specialty resorts can range from country inns to athlete/fitness oriented.