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Photo: Terry Ballard, CC BY 2.0 via Wikimedia Commons
A 42-acre arboretum known for its collection of exotic trees, including the world's largest dawn redwood. The only accredited arboretum in the New York metro area. Also contains the 200-year-old manor house, "Munnysunk".
Bailey Arboretum is a 42-acre (17 ha) arboretum located in Lattingtown, New York, a small village on the North Shore of Long Island. It opened to the public on Aug. 5, 1969 after being donated to Nassau County in 1968 by the heirs of Mr. and Mrs. Frank Bailey. Through an agreement with the Village of Lattingtown, admission to the arboretum was limited to 200 people at any one time.
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Bayville Adventure Park features a miniature golf course, rock climbing, a bumper boat safari, a ropes course, a maze, and a funhouse. There are many restaurants nearby. Bayville Adventure Park is a good place to go for a family excursion.
http://www.plantingfields.org/
The estate and home of industrialist William Robertson Coe, now a State Historic Park. The mansion, completed in 1921 and constructed in the style of an English castle, has been restored to its early twentieth century appearance and is open to the public.
A self-guided walking tour visiting several historic buildings and locations in downtown Oyster Bay.
A 550-acre nature preserve that contains Chelsea Estate, Nassau Hall, and the ruins of Knollwood Estate.
The summer home of President Theodore Roosevelt. Includes tours, a museum, and a visitor center. It is run by the National Park Service. From the website: Access to the Theodore Roosevelt Home is only by guided tour. Same-day tickets can be purchased on a first-come, first-served basis from the Visitor Center. Advanced reservations to tour Theodore Roosevelt's home can be booked through Recreation.gov or call +1-877-444-6777.
A research institute known for advancements in molecular biology. Offers walking tours of the campus by advance reservation.