You are stranded on your own on an alien planet for one week until help arrives. You have modest food, environmental protection (e.g. suit with oxygen as appropriate), a weapon in keeping with the film, and make-do shelter, but by no means are you in a safe or secure position.
In which of these environments would you LEAST want to have to weather that one week?
Note: assume the hostile 'elements' of the film/tv show hold, but you have no colleagues, high-powered/exotic weapons or default "shelter" of the film/tv show.
Further Note: This is NOT (likely to be) your favorite film.