Should workouts be all work and no fun?

I've skied mostly Pineland this winter but skied Riverside today because its only about one mile from my house. I did 16K in about 1:05. It was a decent workout and I was able to concentrate on my abdominal crunches during my poling in my v2 for long stretches. But it felt like going to the gym, or what I imagine going to a gym would feel like (I've been to the gym once since 10th grade). By contrast, when I ski for 2 hours at Pineland, it is fun, fun, fun, and the time flies. There is no monotony at Pineland. But Riverside has long stretches of...flat.