First, thank you for at least taking the time to try and understand how the history of Hawaii has shaped many of the issues facing Hawaii today. Second, I will add that I was not born in Hawaii but lived there for several years and have learned a lot about it myself from my wife, who was born and raised there and did research into some of these issues as a graduate student.
> We love visiting the islands but learned a while back that large parts of the indigenous population see the US as an occupying entity and not their country. While heavily relying on the tourist income, this creates a challenging relationship between the locals and visitors (not to mention the disrespect some tourists show to the local land and culture).
Yes, there is a contingent of the Native Hawaiian population that is making the case for sovereignty. Again, I do not have skin in the game, nor am I an expert in these matters. However, it is acknowledged by the U.S. itself that the sovereignty of the Kingdom of Hawaii was undermined through force and not by any mutual treaty or agreement; https://en.wikipedia.org/wiki/Overthrow_of_the_Hawaiian_King....
However, your statement seems to be conflating "locals" with Native Hawaiians, which is incorrect (but not uncommon among many Americans). The majority of the current local population are descendants not of Native Hawaiians but of other laborers that were brought to the Hawaiian islands by U.S. persons-owned sugar plantations during the 19th century, "Few natives were willing to work on the sugar plantations and so recruiters fanned out across Asia and Europe. As a result, between 1850 and 1900 some 200,000 contract laborers from China, Japan, the Philippines, Portugal and elsewhere came to Hawaiʻi under fixed term contracts (typically for five years). Most returned home on schedule, but large numbers stayed permanently. By 1908 about 180,000 Japanese workers had arrived. No more were allowed in, but 54,000 remained permanently." [https://en.wikipedia.org/wiki/Hawaiian_Kingdom#Economic,_soc...]. Considering that the current population of all eight populated islands is only around 1,415,872, you can do some rough math based on average population growth from those workers to get an idea of how much the influx of these laborers changed the demographics of Hawaii.
> "This issue was made very apparent during a Pearl Harbor tour when the bus driver described how many Hawaiians actually identified more closely with Japan than America during WW2 (and still do to this day)."
I will not speak for this bus driver's opinions, but I would encourage you, if you get another chance, to take a look at the memorial plaque of civilians who died during the attacks on Pearl Harbor an observe how many names were of Hawaiians (locals, not native Hawaiians) of Japanese descent; although these individuals were also Japanese-Americans, Hawaii was only a territory at this point and did not become a state until 1959.
My point here being that who the Japanese-Americans in Hawaii "actually identified more closely" with at the time of the attack on Pearl Harbor is complicated. Considering that: 1. Hawaii was not a state at that time 2. Many Japanese (and Chinese/Filipino/etc.) were residents of Hawaii prior to it becoming a U.S. territory 3. The government sanctioned xenophobia/racism at the time.
Another important data point to keep in mind on this subject was the service of the 442nd regiment during WWII itself; which to this day is the most decorated unit of its size https://en.wikipedia.org/wiki/442nd_Infantry_Regiment_(Unite.... Meanwhile while they were fighting on behalf of the U.S., many of their relatives and family in Hawaii faced outright discrimination based on their descent and appearance (not to mention any relatives they had in California who were straight up imprisoned simply because they were of Japanese descent).