The answer is MAC 24/7 , Hilton Waikiki Beach. We were staying at Hilton Hawaiian Village and this Hilton is different one.
On the lobby floor, you can find this place. The one we ordered is Baanana, Walnut and Chocolate Chunk. Now I just checked their menu.... mmmm, the Elvis also sounds good. We parked at the hotel, with validation, it costs another 3 dollars FYI.
If you like, pancake, please try !!! Their decor is also nice, casual.