Mori Art Museum & Roppongi Hills is a real time commitment — fit it in only if it's a priority.
Allow 1.5–2 hrs.
A strong rotating programme of contemporary art near the top of a tower, with a combined ticket to the Tokyo City View deck — art plus a skyline in one stop, open late. The catch: it's exhibition-dependent (a show you don't care about makes it a pricey view), and Roppongi at night can feel like a touts-and-bars district.