It's too cool to hang around outside so We asked if we could wait in the Executive Lounge. No. We were politely told that's only allowed for registered guests.
We've been invited to wait (no need to ask) in numerous Asian, European, and Australian properties so we were a little surprised.
However, we saw the lounge on our previous visit and know we're not missing much, at least by the standards of overseas Hilton properties.
The lobby is quite pleasant once we found a place to sit.