US citizens, what is a tip that everyone should know, be it national or local?
I'm thinking about things like free museums Sundays or times to get specific things (e.g. candies after Halloween as they are on discount)
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If you visit the Washington DC area, all of the Smithsonian museums and the National Zoo are free all the time. Want to pop in and see the the Hope diamond (National Museum of Natural History) or Dorothy's ruby slippers (National Museum of American History) you can and not feel bad if you don't want to stay. Some specialty exhibits have timed tickets, but those are free too.
A couple of the really popular Smithsonian museums do require reservations though, which you can sign up for free on their websites ahead of time.