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A 550-acre nature preserve that contains Chelsea Estate, Nassau Hall, and the ruins of Knollwood Estate.
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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.
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 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".
A research institute known for advancements in molecular biology. Offers walking tours of the campus by advance reservation.
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.