I am a novice, don't even have my Model S yet. It is finished with production, however, and being shipped and I should have it in a couple weeks or so. My wife and I are taking a long trip and may want to go from Missoula up to Glacier National Park. My check of milage shows 147.5 mi, so one would probably need power at GNP. Anyone done this trip? Can you say where to get power in the park? Any Tesla friendly places? Thanks.