Many things will be missed during the trip, this is very individual. But examples can be different types of food, doing things with friends and family, be inside in nice warm conditions, drive a car and look at the speedometer and see the kilometers go by to mention some. But this is one aspect; a very important measure is that when the trip is finished, we will miss these surroundings just as much, so we must enjoy them as much as possible now when we have the chance!