This museum isn't massive,, but large enough to spend a couple hours and see some very impressive art. Entry to the standard collection is free, but special exhibits require purchasing a ticket.
Their standard collection include Dali, Marcel Duchamp, Man Ray, Picasso and many other well-known artists. We were there for the Yayoi Kusama exhibit which was a lot of fun - many interactive and engaging pieces.
There are some nice large sculptures on the grounds, too, and the island is an easy walk with nice grounds.