We were there Jan 5-10, 2006 and found it pretty easy to do what we wanted without much of a wait for anything.
We went to AK on the day of the full marathon. The park was roped off in spots for the runners. It made it a little difficult, but not too bad.
We had to wait an hour to bus back to POFQ at 1:00. That was the only rough patch we had that could have been due to the marathon.
One problem we weren't expecting was the COLD! We had coats, hats, and gloves, but it was still cold in the mornings and at night. I almost bought a blanket one day at noon and I had a coat on!