In Kauai hitchhiking is safe and acceptable, many started out on kauai without cars and hitchhiked themselves. There are good & bad area's to hitch, you always want to be where the traffic is slowest in the area and where there is a safe spot to pullover.
Most people would not consider hitchhiking or picking up a hitchhiker in most major US cities, one of the many beauties of Kauai is that hitching is safe, reliable, fun and environmentally user friendly. I hitchhike regularly from Kilauea to Kapa'a and have never waited more than 15 minutes for a ride, I am not a beautiful woman and people still stop. I have been picked up by visitors wanting to know things to do that aren't in the tour guides, I have been picked up by young and old, male and female, from island beaters to brand new four wheel drive pickups.
Why not give tax incentives for people to hitch-hike and people to pickup hitchhikers. Imagine if every time you hitched it was worth $10.00 and every time you picked up a hitchhiker it was worth a 10.00 credit towards a write-off on ones taxes? There could be designated hitching stops for safe pickups and drop-offs.
Hitchhiking would allow people to meet their neighbors save gas and keep the environment cleaner. Hitchhiking is not only environmentally friendly but a fun way to socialize and meet people.
To expedite getting a ride do not wear sunglasses or have direct eye contact with on-coming cars and look relaxed. I have met many good friends by hitching.If you have never hitchhiked, try it you'll like it.