Pandemic 2: The land of the infected

It takes you all around half hour to walk through the harsh outback desert to get to the minimall. When you get there, it looks entirly deserted and ransacked. So far, you have circled the entire mall from the outside and have not found any service stations. Its kinda werid to see a deserted mall in the middle of the desert but it isn't that far away from the city.
You go inside to see that it is almost compleatly dark, who knows what lurks within its creeping walls.
You can see about ten meters into the shopping mall, it has two floors, which one will you take?