Gryffindor: Runs of to explore constantly. Is the reason they're lost in the first place.
Ravenclaw: Looking around, figuring out what's edible and what's not, where they can make shelter, and how to get out.
Hufflepuff: Trying really hard not to cry so they can be there to comfort the others. Makes flower crowns for everyone, and keeps track of food.
Slytherin: Already plotting their own survival plan. If that means cannibalism, it means cannibalism. (They're only slightly joking...)