Portland, for me, has two major draws: good food, and easily accessible outdoors.
So, depending on what you like to eat, hit up a couple of Portland's better food options - there's too much to choose from, but I could give you recommendations based on what you like to eat - and then go out to forest park or into the gorge a little ways.
The Blazers game will be a blast. There are always a bunch of Jazz fans who show up. Only other away team that shows as well as the Jazz are the Lakers.