"the high one" as called by the Koyukon people who are native to the area

tkimmins is correct. Northern Lights can see seen from Denali during the winter months.

I was there in late August. Cool weather, didn't see one mosquito. I thought that to be unusual. It was sunny all day and maybe that kept them at bay.

Noooo

It is absolutely beautiful. Lots of animals out as well.

Weather dependant in the fall it took us about 4 hours.

I don't recall any sand pits on our visit. Perhaps you would need to contact the National Park service for an "official" answer.

Driving is easiest, can check on availability

Yes,