Worst:
- Squeezing between big trucks and the median curb at an intersection on a 65 mph hwy (I approach slowly hoping I'll catch the red light).
- Afternoon thunderstorms
- The big hill I have to go up to get home toward the end of my ride when I'm exhausted
- Erratic prairie dogs who wait until just the right moment to run out into the path/shoulder

Best:
- The view on the way into work, the next best thing to being in the mountains is looking at them while riding my bike!
- Getting in 37 - 42 miles a day, saving gas and time by combining my workout with my commute
- A long list of possible routes (most of which are very nice)