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Take a cab to Redhook, ferry to St. John, cab to the start of Cinnamon bay trail,and hike down the trail (all downhill) to Cinnamon bay. Then take another cab back to the ferry and either ferry back to Red Hook or the longer ferry ride all the way back to C.A. where you're ship docks. Ferry times and routes are available on the net. You will save money, avoid the crowds and see some incredible scenery.