The Kahala's official 1985 milestone names Princess Diana and records a 100-room entourage requirement. The Washington Post named the Kahala Hilton as the planned place of rest, and contemporaneous follow-up reporting described the Hawaii stop as overnight and 18 hours.
Princess Diana stayed at the Kahala Hilton in Honolulu with Prince Charles during an 18-hour Hawaii stopover in November 1985. The property is now The Kahala Hotel & Resort. The hotel's own historical timeline says the royal visit required 100 rooms, while reporting published before and immediately after the stopover places the couple at the exact hotel.
Source conclusion:
The cited sources support a stay at the named hotel.
