Just a boat ride from Beacon NY and then a 72 stair climb, you can check out the ruins of Bannerman "castle," which is really the crumbling warehouse for a WWI arms dealer. I will be playing in front of the Bannerman's former summer home on top of the mountain, which also looks like a little castle. Come hang! It's a lovely little island owned by the NY State Parks Dept.
$40, includes a self guided tour and boat ride to and from the island