Most of the insects you’d be looking for in Hawaii are actually invasives from Asia. Oryctes Rhinoceros and Protaetia Orientalis are both interesting species from Asia, though one is considered a major pest. The way they treat the two species is drastically different, when I visited Oahu the USDA agents at the airport allowed me to transport a couple of P. Orientalis and several Pacific Beetle Mimic roaches after I declared the specimens to them and they inspected them (Hawaii airports have a special detection device that supposedly detects anything organic in your luggage). Attempting to transport live O. Rhinoceros species is illegal, and may be invitation for a fine (they take invasives in Hawaii very Seriously). Other than that, there are a few species of Asian roaches (as well as Surinam Roaches), scarlet millipedes (another invasive) some very large Centipede species (I don’t know what they are but I did see one, it was very large) and a very interesting species of Orbweavers that sort of resembles our native spiny back orbweaver, but (if I’m remembering correctly) has pink, yellow, and some other colors on it. I didn’t mention any of the various Gastropods because all of them (that would be of interest) are invasive and almost certainly illegal to transport (namely Pancake slugs and GALS). The insects you find on Maui could be somewhat different from the ones on Oahu, but I doubt they’d be too dissimilar. If there’s anything you wanna know how to find more specifically I can tell you that too