wild1apache

I am on Liberty of the Seas on Sept 2 and our cruise has now been diverted from Bermuda to Portland, Maine and Halifax, NS. I love Halifax, but am at a loss as to what to do in Portland. Does anyone have any ideas?? Also, how would I even book a shore excursion at this late date? It says that everything is closed because we are 2 days out from sailing. Does this mean that we have to stand in horrifically long lines once we board the ship to book an excursion? Need direction, please. Thanks in advance.