@wangling you are armed with lots of information. You know what precautions to take to mitigate risks of contaminated drinking water (boiling, LifeStraw, or other filter, cool showers) air (wear mask when dusty) soil (no gardening while on vacation!) I suppose you could contact health department in Oahu and see what they have to say, or ask your doctor if they know another professional in HI for a consult to gather more specific locale details.