Locust Grove is an actually a museum and nature preserve! You can take a tour of the mansion or explore the hiking trails.
Fun waterpark recommended by Mike! He says they have excellent curly fries. :)
Boscobel is the home of the Hudson Valley Shakespeare Festival! This is a Schepis Family favorite. If you happen to be coming to the area a few days early or sticking around the wedding, you can buy tickets here >>> https://hvshakespeare.org/.