Explore two private gardens in Great Neck and Roslyn Harbor, open to the public for self-guided tours to benefit the Garden Conservancy. 10am to 4pm. No reservations required; rain or shine. Begin at the Tranquility Garden or see website for additional location. Highlights include shrub rose borders, a vine-covered arbor swing, pond, stream, and waterfall, woodland gardens, beaded totem poles, formal boxwood gardens, and a greenhouse filled with succulents.