I visited Vanuatu as part of the 2022 Alaska Airlines deal for 20,000 points OW in Y or 40,000 points in J. Since Alaska offers free stopovers, I booked a one-way ticket from the US to Fiji with a stopover in Port Vila.
My seatmate on the flight to Port Vila was going to Vanuatu for the sole purpose of purchasing Vanuatu citizenship through the very cheap citizenship by investment program.
However, I really wanted to visit the island of Espiritu Santo, instead of the island Port Vila is located. Therefore, I had to fly Air Vanuatu domestically roundtrip from Port Vila to Santo on an ATR 72. It was pleasant, but I didn't realize they only have a single ATR 72 aircraft.
When I was back in Port Vila awaiting my Fiji Airways flight back to Nadi, another flight leaving around the same time, the 737 Air Vanuatu flight to Brisbane, which had only recently resumed flights due to the ending of the COVID-19 lockdown, was delayed a few hours due to technically issues.
I really enjoyed Vanuatu as a destination. It's not for everyone (it was much more rustic than Fiji), but it was quite beautiful. Because it had been closed for COVID for so long and cruise ship traffic hadn't restarted, I had sites like Champagne Beach or the blue holes to myself. Unfortunately, I didn't have time to see the volcano.