Some great attractions and venue include JFK museum, historical walking tour, Boston harbor boat tour, USS Constitution, Boston Tea Party historical site, science museum and IMAX theater, Harvard Square, and the indoor farmers market.
About... The visitor centor? It has functioning bathrooms and keychains/magnets as well as maps for tourist attractions. The city overall has a lot of great things to see- I think the freedom trail is worthwhile, but if you're looking for something more fun, wandering downtown is enjoyable too! I also recommend doing a ghost tour at night. :)
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