Is it unethical to visit Hawaii as a tourist?

[MarkD]

No.
This question reminds me of a story shared online around 25 years ago by a travel agent.
She had booked a large group of businessmen on a two-week business trip to Honolulu. One day, weeks before the trip was to begin, she received a call from one man within the group who said he wanted to spend an additional week in Hawaii for pleasure, see the other islands, and he asked the travel agent to book cars and hotels for him. She proceeded to discuss with him which days he wanted to see which islands, and booked the cars and hotels for him as he asked. Then she started discussing plane departure times.
"Whoa," he said, "there's no need for that. Remember that I'm renting cars. I'm just going to drive to the other islands."
(Pause.) "Sir, you can't drive from any island of Hawaii to any other island. There are no bridges between any of the Hawaiian islands. The islands are all too far apart for any bridges to be built."
"And you call yourself a travel agent?!? Don't you know there are bridges all of the way from Maui to Key West?"
(Pause.) "Sir, you seem to have gotten the state of Hawaii confused with the state of Florida. If you were going to Florida, you'd be correct that there are a series of bridges between the islands known as the Florida Keys, and those bridges make it possible to drive all of the way from Miami to Key West. But you are not going to Florida, sir, you are going to Hawaii. And you CAN trust that I know what I am talking about when I say there are no bridges between the islands of Hawaii."
There was a pause, then he said, "I'll call you back," and hung up. Of course, she never heard from him again.