If the tour is run by a Hawaii non-profit, tipping is definitely appreciated. We leave anywhere from $5-$20 per person, depending on how we feel about the tour and the organization.
You don’t need to tip the front desk staff at Hawaii hotels, but there are definitely a few people in charge of your stay that do appreciate a gratuity.
If you are eating at a Hawaii restaurant, you’ll definitely want to make sure to leave a 15-20% tip. And while you can add a tip to a credit card, cash is much more appreciated.