abby
pak had a lot of good suggestions. I would strongly add halibut fishing out of Homer or Valdez. Seward is probably good for halibut also and the sea life center is worth a look. If you drive, take the ferry on the marine highway for one of the directions, either up or back. I found the ferry nice, as I only got to see Juneau the 5 years I was there. When I took the ferry, I got to see places I had only heard of while I was in Eagle River. You can actually go on Matanuska glacier which is on the Glenn Highway. In the 5 years I was there, I feel I only scratched the surface of what was to be checked out.
