The three most common questions you hear from tourists on Kauai are:
1. "What's with all these chickens?"
2. "How do I get this red dirt stain off my shoes?"
3. "A loaf of bread is HOW MUCH?"
The last time we were on Kauai in 1987, I remember that there were chickens wandering around at a few remote locations, but now they are everywhere! The story that I heard was that they really proliferated after the hurricane in 1992 when a lot of domestic ones escaped and mingled with the wild ones.
They are harmless and seem to have the good sense to stay out of the road. I don't recall seeing a single road kill during our trip. Most places discourage you from feeding them. Probably the worst thing is that they crow constantly instead of just at sunrise, so if they congregate near where you're staying it could get rather annoying after awhile.
As for red dirt, forget about it, your shoes are stained for good. The Red Dirt Shirt Company can dye about a billion shirts with one bucket of mud (only a slight exaggeration), so if you want to keep your expensive Nikes shiny white, don't wear them anywhere around Kauai. On the other hand, the red dirt adds an extra dimension to the colorful landscape of Kauai and can make for some great pictures.
It's kind of funny that some people don't bat an eye at spending hundreds of dollars a night for a hotel room, but make them spend an extra buck or two for a loaf of bread and they go into sticker shock! Get use to it, every single grocery item on Kauai costs more than you pay at home, but for some reason the price of bread is the most upsetting. Shopping in the bigger grocery stores like Safeway and Big Save (ha! now THERE'S a misnomer!) is best. The closest grocery to Poipu is the Big Save in Koloa but it's not that big compared to, say, the Safeway in Kapaa. If you're going to be staying for any length of time, find out when the deliveries are made -- the shelves at Big Save in Koloa were pretty bare of a lot of essentials on Sunday night. Many folks stock up on their non-perishables at the Walmart in Lihue or the Kmart in Kukui Grove on their way from the airport.