I was in Hawaii a few times during the eighties, courtesy of the "Big Grey Boat" and Uncle Sam. Always on Oahu, I never visited any of the other islands. I rode "The Bus", which is the name of the bus line, around the island to the North Shore and back. I saw lots of scenery that way, The buses ran every half hour, so you could get off at a place of interest and look around till you got tire, and then catch the next bus. Unfortunately, one in six or eight of the buses made a detour into the heart of the island, where the pineapple fields were. I got off there and looked around, then went back to the bus stop (which was about the only building around, the front porch of a general store that was closed). I waited and waited, then looked at the schedule. No bus for another hour and a half, and I had already been there quite a while. I saw enough pineapple fields to suit me for a lifetime.
It is my understanding that mosquitoes, like many of the other pests on the island, are not native. Their larvae were brought over in the 19th century in the ballast of ships, which was dumped in the harbor when the ships were loaded. They seemed to like the place, because they are abundant now.
Geckos are good cockroach eaters, but are no match for mosquitoes. Many cruising sailors keep geckos on board to keep the pests under control.
Quod scripsi, scripsi.