If you're visiting NYC before or after the wedding, there are plenty of different activities to do! You can visit the Top of the Rock, Statue of Liberty, Times Square or Central Park. There are also a variety of Broadway shows to see such as Wicked and Hamilton.
The Old Westbury Gardens are great to visit at any time of year! The grounds are beautiful to walk through at your own pace, but we also recommend a tour of the main house to learn about the history of the gardens.
For anyone who is interested in the aviation history of Long Island, the Cradle of Aviation museum is a great place to visit. Long Island has a rich aviation history, particularly during WWII. You can also find an Avenger class plane from WWII that is the same class of plane Alessandra's grandfather flew in during the war!
For anyone traveling with children, the LI Children's Museum is a great place to let them explore and learn new things and burn a little energy!