Hawaii is the States, name as well as one of the Islands names. So are you going to ... the Island of Hawaii or were you talking of "going to Hawaii"?
Big difference and 7 major Islands here. Car camping is fun and there are sites on some islands to do so or pull up to a beach and camp. Also be aware of the "undesirables" that may want to hang out and drink beer with ya .. just saying..they're everywhere...