A family friendly moderate level 2.5 mile hike exploring the former quarries at Sylvan Glen Park Preserve that supplied honey colored granite for the approaches to the George Washington and Whitestone bridges. Includes a stop at the 18-foot circumference Quarry Oak. Rain or shine. Duration: 2.5 hours. Some assents and descents and uneven terrain. Not suitable for children under 6. Co-sponsored by the Yorktown Trail Town Committee, the NY-NJ Trail Conference and Town of Yorktown.