Poll: Stranded! (Alien Planet Edition)

This is one of a series of "Stranded" Polls. 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. Discuss here