I have been allowed to stay at the Hilton on Kuhio until 4 pm with Hilton Gold.
When I had SPG Gold, I actually paid for an extra night at Sheraton Kaiulani just so I can stay in the room until 8 pm for an 11 pm flight. When I checked in, the CSR told me there is no need to pay for the entire night; for an extra $75 I can stay in the room until 8 pm. Not sure if that is their standard or its because the hotel was not going to be full on the day I would be checking out.
The hotel though is dated and desperately needs a remodeling.