Spent a great day at Shelburne Museum. The weather was lovely. Not sure I would go in the rain since there is a bit of walking between the buildings, train car, boat, etc. There are many interesting collections housed on the property, including circus memorabilia, horse-drawn carriages, dolls, quilts/samplers, glassware/dishes, guns/rifles, stuffed bear (taxidermy). They have a covered bridge, one-room school house and a lighthouse, also--something for everyone.
There is a cafe for lunch or snack. Definitely take the 15 minute tram ride around the property before starting out on your own. It was very informative and gave you the "lay of the land". Plenty of parking and a large gift shop. We spent 4 hours but went into every building and rode the free carousel. You could easily spend more time if you read all the informational placards.