Like:
1. Uphill time trial to the work.
2. Downhill all-out sprint back home.
-With occasional traffic light drag race vs. some boy-racer in his old VW Golf (wish I have a camera when these happen).
3. Being faster than the morning rush hour traffic.
4. Stepping out into the fresh air after a day behind the desk.
5. Headwind.

Dislike:
1. Bonehead maneuvers by other road users, especially motorists (especially bus- and taxi drivers)
2. Stepping into the stagnant, oxygen-lacking air of the workplace.
3. When my light's battery unexpectedly dies in the dark.
4. An occasional city-dwelling fox who doesn't take a look when crossing the road.
5. Headwind.