My entire commute is pretty nice. The only part of my commute that I dread is the first 5 minutes of my ride home. I ride about a block in a hot/stuffy parking garage, exit up a ramp and merge with traffic at a stop light. Then I ride in a bike lane for about two blocks where I have to dodge pedestrians, busses, and cars. Then get on a feeder trail, go up a hill and merge on to the MUP. Then it's down hill on the MUP for a few minutes. By that time, I'm warmed up and life is good. The only reason this part of my commute sucks is the DC area commuters. They are a PITA (and I am one on days I don't ride).