The Hudson Valley is a beautiful area, but it’s difficult to make recommendations without knowing a ballpark budget. I guess how far you go depends on how much vacation time guests have and if they’re willing/able to pay to spend it at someone else’s dream vacation location. If the wedding is held in the Northeast it saves on travel costs for guests, but if finances aren’t an issue then I’d consider some of the suggestions in the Southeastern US. There are some beautiful gardens there.