Mary Jane and Winter Park are different "territories" of the resort Winter Park. Winter Park territory is, I believe (correct me, locals), the original resort. It's groomed frequently. Mary Jane has an entirely different character — natural snow, natural bumps, with a dash of mildly extreme. If you're skiing Jane, you're not skiing Winter Park (except in the general sense).
When one New Yorker asks another where he or she lives, the response is more likely to be Park Slope or Inwood Park than New York City.