Not sure I understand the fascination with wanting to leave an airport once you're there on a layover, try to go somewhere unfamiliar to see something, only to possibly rush back, and if there are any logistic issues, you're gonna miss your flight. And you're on a trip to Hawaii, which is awesome. Yes a six hour layover sucks but there's no way I would leave the airport, especially in Los Angeles and then make sure I have to hustle back to make my connecting flight to Hawaii. You even said you don't travel much so you're not sure about anything, if it were me and your situation, I would be a nervous wreck the whole time. Just have the kids bring whatever they need to entertain themselves, go on long walks in the terminals, look for some places to eat, whatever you need to do to kill the time and just let them know that yeah this part of the trip sucks but we are going to Hawaii and that's gonna be awesome and worth it.