Bear Mountain Inn overlooks Hessian Lake and provides fine food and overnight accommodations. Manhattan residents can escape the city and be in the park's rugged mountains on the Hudson River in about an hour. http://visitbearmountain.com
Virtual Map of State Park http://nysparks.com/parks/attachments/BearMountainTrailMap.pdf
Enjoy boating at Hessian Lake with row boats and paddle boats ($5 per hour)
*And children under 12 yrs must be accompained by an adult.
Or if you the hiking type enjoy miles of trails discovering different species of birds && wildlife along with star-gazing along your trail walks.
You can also enjoy the 360° views of New York City, east to Connecticut, Mount Beacon as well as the Shawangunks.