Love
... riding on deserted patches of road and clearing my mind of everyday troubles
... riding in challenging weather (rain, light snow, etc)
... early morning and late afternoon rides (sunrise and sunsets)

Hate
... heavy vehicular traffic
... pedestrians taking up sections of MUP or road, especially ipod zombies
... flats and break-downs, especially at the beginning of the ride

...and obviously, hate not being able to ride!