April 21, 2026. Iona Island Marsh is on the outskirts of Bear Mtn State Park and is a “brackish estuarine marsh in a near natural state that fringes the Hudson River” (NPS). Part of Iona Island was an ammunitions storage area during both World Wars and the Korean War, so public access is strictly limited to the marsh.

Nyack Beach SP and Hook Mountain are together a National Natural Landmark due to the Palisades Sill (200 million-year-old intrusive igneous rock) exposed on the sheer cliffs. The cliffs are best viewed from the water or, if one is driving, on the road coming into Nyack Beach SP (North Broadway). There are a few trails leading along the water’s edge and also toward Hook Mountain’s summit. There’s a sculpture by the river celebrating the Hudson River Art School, and one can see the Tappan Zee Bridge. Hook Mtn’s summit affords near-360 degree views, and one can see part of Manhattan’s skyline in the distance. The Long Path goes over Hook Mtn’s summit.