A friend of mine just left today, she was visiting from Toronto and she's both a skier (intermediate) and boarder (noob). She left her board in Toronto because she didn't want to slow anybody down or limit herself in the runs she could do at Fernie. Turns out she was bored after a few runs on her skis and was talking about renting a board for the second day. I took her out myself on day 2 and showed her more of the mountain and I think she had a lot more fun, but her gut reaction was still that she found skiing boring and snowboarding more of a challenge.
This is exactly how all my friends were when I taught them how to snowboard. They had all skiied in the past but said snowboarding was much more fun because there is so much more of a challenge. I have never tried skiing, but I have never gotten bored of snowboarding; there's always new stuff to learn.