Hot Tub Time Machine/Headscratchers

• I realize this film is not to be taken too seriously, but at the beginning, after the time trip, how on earth did the four of them get to the top of the mountain without passing through the ski lodge or seeing anyone else?
  • Lou found a trail in the woods?
  • They were all hung over and exhausted, they might have been wandering through it all in a daze and actually passed those people by without actually noticing them, and just sort of hazily noticing everything. "Wow, little busier this morning." "Huh, the ski lift's still that cheap?" "I feel less achy than usual, huh."