Michelle M.
Google
The upstairs is a little museum of larimar, with displays, cases, exhibits, and specimens of the semi precious stone that the Dominican Republic is very proud of, and rightfully so, it's a beautiful rock.
It was a little over a dollar to go inside I think, which isn't much. Though the museum is pretty small and it's about a 5-10 minute experience. Though kind of fun if you're a tourist.
They said if you keep your receipt and ticket you can use it to gain entrance to the Amber Museum as well