I am only malihini (not born and raised in Hawai’i) but I’ve been spending significant amounts of time on the island of Hawai’i since 2002, and I moved here permanently in 2018. Plus, I work at a cultural center - which has disappointingly limited Native Hawaiian participation, though not for lack of trying. Still, my work has given me the opportunity to talk in-depth from time to time with various Native Hawaiians about issues of identity, opportunity, redressing past injustices, and where Hawai’i should aspire to go in the future.
Like any complex social issue, the OP’s question doesn’t have a simple answer. I would characterize the majority of Native Hawaiians as being well aware of, and unhappy about, the overthrow of the Hawaiian Kingdom and the subsequent cultural, economic, and other forms of damage done to local communities.
There isn’t one well united separatist movement, however. There are various different groups (typically aligned by family connections) with different positions. Take the protests against the TMT (Thirty Meter Telescope) on Mauna Kea. Yes, there have been very visible long-term protests on the mountain, supported by indigenous organizations from around the world. However, while they may be less vocal, there are plenty of Hawaiians who support TMT.
Also, the “pure” Native Hawaiians are limited in number. A lot of people are mixed race, and an ongoing question is what the minimum portion of Native Hawaiian ancestry you must have to quality for homestead lands.
With that as a very brief intro to a really complicated situation, I would say that most Native Hawaiians support responsible, managed tourism (which means fewer tourists who behave responsibly and consume fewer resources), complemented by state-supported attempts to diversify the state’s economic base. A lot of jobs rely on tourism, and it’s hard to see what could replace it as the primary economic driver, given the islands’ remote location. One industry that seemingly shows promise is alternative energy. Certainly there is a movement to make Hawai’i a leader in R&D for sustainable solar, wind, and ocean thermal energy conversion.
@smithsb is also correct about the crazy real estate prices and resentment against rich outsiders buying up all the land. I think that is especially a problem on Maui, but it’s true pretty much everywhere - there is a significant shortage of affordable housing. (The news at the moment is filled with discussion of an emergency order by Gov. Josh Green that will cut through some of the red tape/environmental rules to speed the development of new housing. Not everyone is happy about that, fearing the possible loss of habitat for endemic species and other concerns.) That’s not precisely the same issue as tourism, but in terms of how people view outsiders and how they would like to see Hawaii’s future, it is related.