Tickets are free, but without reservations, the line can take an hour + on weekends.
The Infinity Room by Yayoi Kusama is in high demand & difficult to get in, soon to be taken down in September. We recommend getting to the museum early to have a chance to see it yourself. Once inside, reserve a time-slot at an iPad kiosk in the center of the lobby.
The artwork is very enjoyable with many great contemporary artists displayed and interchanged often.