The other poster was absolutely correct. Once the beneficiary has the Visa and enters the US, they can then travel throughout the US without any restrictions. You can get married in Hawaii, Florida, Alaska or wherever you choose within the US. The only travel that is not allowed is travel outside of the country. If he leaves the US before he gets the proper documents, he will not be able to re-enter the country until he has his green card or he gets travel approval, which can be applied for when adjusting status.
Good luck to you and I hope it all goes smoothly.
If you meant:
Michael receives his K-1 visa later this year, arrives in Seattle, and you both travel to Maui to get married within 90 days of his arrival in the US, then that is perfectly fine. You don't have to get married in Seattle.
MichaelJeanelle reacted to UK-USA-K1 in Can anyone answer this question? Please and thank you :)