Have them come to Hawaii, specifically, Kauai. The most beautiful of the islands.
i also vote for Kauai! we went to Maui on our honeymoon 25 years ago and it’s gorgeous but more congested than Kauai [where we have been several times since]. We stayed on the big island this past summer, which is very different, very lovely and even less congested, but Kauai is my favorite. perfect honeymoon spot!