Kew Garden's definitely!
You'll have to take the train (about an hour or so?) and it will be an all-day affair (but you can be back by evening). The whole grounds are just great, and they do have a wonderful orchid house, as well as other "houses". I can't think of any place in the US that has that much to see.
Kew Gardens or not . . . have a great time!
Ed
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