LEGOLAND® Discovery Center Osaka.
Price is good, cheaper than walk-in rate, and entry is seemless. Just present name & booking number at counter will do, in exchange or actual entry tickets. Most importantly, ticket is eligible for entry any time of the day (not after 4pm entry). I arrived at 10am. Highly recommended. Small cafe in the centre, hence not many choices of food. But there is a variety of food at food court at marketplace just outside of the centre. No re-entry.