If you visit, be sure to spend some time in the museum's bookstore. There are some great books for adults and children and a really nice collection of items that would be perfect as a gift or a memento to take home.
For lunch, Rhinebeck is always a good option. There is a variety of places to eat but our favorite is Bread Alone. On the weekends they offer both breakfast and lunch options but everything is delicious. We've tried lots of things on their menu and have never been disappointed.
Also in Rhinebeck are some shops that aren't to be missed. Every time I go in Hammertown Barn, I want to completely redecorate our entire house, all with things purchased here. Right next door is Oblong Books & Music, where we usually spend a good deal of time browsing. They have a fantastic selection of children's books and I usually pick up something for myself as well.
This is a great day if you are in the NYC area and don't mind driving a bit. The area is gorgeous in all seasons and most sites are open year round. A great time to plan a trip is in the fall to pick some apples and pumpkins and to take in an air show at the Old Rhinebeck Aerodrome.