Camper

n.
  1. One who lodges temporarily in a hut or camp, especially who sleeps in a wilderness for recreation.
  2. A person who stays at a summer camp or day camp.
  3. A vehicle, such as a small truck, or a pickup truck with a hood over the back, equipped for convenience while camping out.
    4. happy camper
    a person who is pleased with the situation in which s/he finds him/herself. Often used ironically or in understatement, especially in the negative; as, the passengers left behind on the island were not a bunch of happy campers.