Trip to Alaska sounds great, but I feel like I know so little of your husband's situation that I don't know how to respond. How old is your husband? Did he have GBM, I assume so but I didn't see where the post actually said. Did he have surgery? Did he have temodar and radation? Avastin and CPT-11? No recurrence? Anything else?
Did your ask your doctor if it was a good idea to go?
As I understand it, standard treatment is surgery followed by radiation + temodar then temodar for 5 days every 4 weeks. The GBM recurrs on average 6 months aftet the start of treatment. Is this going to put your trip close the the average recurrence time? Of course there hospitals in Alaska, but state is big and so thinly populated, I don't know how quick you could get to medical care if necessary. Or how advanced the treatment for GBM is in Alaska.
Wishing you the best of luck and I sure hope you get to go and have a great time! But think it over carefully. When I was in the midst of my radiation and chemo, my MD said I could go to NYC, but that a little different.