I enjoy saltwater fishing more. I have only fished Valdez in August, trolling for silver salmon. It was a blast, they put up a good fight.
Right now, you may be able to take a charter out and jig for halibut or lingcod. I would bet there are some roadside fly fishing opportunities along the drive for trout, dollies and grayling, but I don't know of any specific spots. Flesh flies or beads work in any stream with a salmon run.