I was doing some reading on Hawaii for a coming trip, and was puzzled by this "exercise tax". This is what wikipedia says

"Hawaii does not technically have a sales tax, but it does have an excise tax which applies to nearly every conceivable type of transaction (including services), and is technically charged to the business rather than the consumer. Unlike other states, businesses may or may not show the tax separately on the receipt, as it is technically part of the selling price."

every conceivable type of transaction? If I buy a gift card, does that mean I have to pay this excise tax too? And how about when I use the card?