1/ Dream: well defined easily followed paths with rideable surfaces.
Reality: nothing to see on the ground except tussocks and bog.
2/ Dream: level grassy bivvy spot next to clean running water with a fire pit.
Reality: uneven sloping pitch, slugs and midgies, the perfect site 500m down the track in the morning.
3/ Dream: no need to poo for the length of the trip.
Reality: squatting over a scrape trying to hold bib-straps out of the way just as a rambling group from the Womens Guild appear in the middle of nowhere.
4/ Dream: warm, clear, dry weather for the whole trip.
Reality: rain, cloud, mist for at least half the trip.
5/ Dream: effortlessly riding 100 scenic km per day.
Reality: knackered, cold and wet after 50km.
6/ Dream: hot gourmet food prepared in nano-weight pans over a nano-weight stove.
Reality: tepid, cardboard textured re-hydrated food.
7/ Dream: clean, accessible water sources along the way.
Reality: drinking through a filter straw from a stagnant puddle of smelly sludge shared with the local insect population.
8/ Dream: Michelin star eateries at convenient locations.
Reality: Spar cold-food shelf.
9/ Dream: Warm, comfortable nights under the stars.
Reality: Cold, fitful nights on a deflating mat under a cloudy sky.
10/ Dream: an enjoyable, fulfilling and rewarding trip in beautiful countryside.
Reality: an enjoyable, fulfilling and rewarding trip in beautiful countryside

Feel free to disagree, dispel me of my prejudices or add to the list.