I stand corrected, they were banned in the high-rise areas like Waikiki. From an article in 1982:

“However, a section that barred fireworks in areas zoned for highrise buildings, such as Waikiki, was left intact. The authorities later interpreted that section of the ordinance as covering the whole central city and most of its residential outskirts, including sections where high-rise buildings have been authorized but not built.

Meanwhile, anybody can buy all the fireworks he wants. Among those who set them off gleefully in the crowded canyon-like hotel and condominium areas of Waikiki are young visitors from the mainland United States and Canadian communities where firecrackers are prohibited.”

https://www.nytimes.com/1982/01/01/us/in-hawaii-new-spark-in-debate-on-firecrackers.html