Trip suggestions sought

I'm looking for trip suggestions for sometime between mid-december and mid-january. Trip will be for up to 7 days, including travel time (3 experienced hikers/campers are going).

Hoping to find a place we can fly into and reach without rental car. Would like:

* Nat'l park or Wilderness area
* 4-5 days of hiking, altitude not a problem.
* Snow okay, but will not have crampons or ice axes and would like to get in enough miles per day to see some remote area or a good mix of stuff.

Thanks