Hawaii doesn't have rainbows on its license plates and driver's licenses for nothing. Some of the most beautiful rainbows in the world can be found in Hawaii. One time, when my best friend (who lives there) took me on a visit to Kaua'i (she lives on O'ahu), where it rains about every five minutes without fail, we had to pull over on the highway in a place called Koloa to get a picture of one of the most stunning rainbows I have ever seen. I still have the picture somewhere; it's absolutely gorgeous. One of these days if I find it, I should scan it in, or if I can get her to send me another copy, so much the better.
There are some gorgeous rainbows to be found here, too, in the upper northeast reaches of the Bay Area where I live now, alternately known as the Delta (San Joaquin/Sacramento River Delta). I've had to pull over and get some stunning shots on my cellphone of fully-arcing rainbows over the highway. I didn't realize until just a couple of months ago that my phone did have a way for me to save photos, and that was to save them to an album online, so all those utterly gorgeous pictures have been lost to the mists of time. Maybe during this year's rainy season I can get some more photos and post them (I promise not to take them WHILE driving, but pull over and take pics!!).
We really do get some gorgeous rainbows, often full arcs.
Sometimes we've gotten the double-rainbow effect, too, but it's rare.