I'm still having trouble finding any sort of indication that there's a law on the books that prohibits travelers from bringing whatever sunscreen they want into the state via air (or boat, I suppose). Nothing on banning possession either. Do you have a source?

Best I can find is that Hawaii prohibits the sale of sunscreens containing oxybenzone or octinoxate, which took effect in 2021.

https://www.capitol.hawaii.gov/Archives/measure_indiv_Archiv...