We have taken the boat out, we have kayaked out and then hiked to the ruins. Both times was a great experience. They often do movies or dinners to raise money to help protect this beautiful place.
Castles? In New York? Why, yes! These ruins are a must, built by the Bannerman family as warehouse facility for their military surplus business in 1901. Get there by boat or kayak, tours available. Read more
Reachable by tour only, whether by ferry or kayak. $35 may seem pricey, but the proceeds go into funding the restoration and upkeep of the island, which doesn't get any state funding, btw.
Most of the time it's $35 per person for a 2.5 guided tour, with the ferry (that's right, one ferry) leaving at 12:30 from Beacon. Just a heads up, "self-guided" tours are only on 3rd Sundays.
The Bannerman Castle Trust organizes many tours by boat during the warm months. For the more adventurous, contact Storm King Adventure Tours to kayak there.
Bannerman Island - Officially known as Pollepel Island, is the home of Bannerman's Castle. Walking tours are hosted by the Bannerman Castle Trust every weekend from May through October. Donations are desperately needed to help preserve the historic structures on the island, before they are lost.