Good source for fishing info
Sport Fishing Information, Alaska Department of Fish and Game

If it's raining (just kidding it never rains in Alaska) here's some things to do in anchorage.

Check out the Alaska Aviation Heritage Museum. I just tried to go to their web page and it's been hacked. Try it again in a week or so.
http://www.alaskaairmuseum.org

Alaska Native Heritage Center
ANHC - Alaska Native Heritage Center Museum - Anchorage

On your road trip:

Denali State Park, camp, go hiking, rent a canoe on Byers Lake.
Denali State Park

Go for a Glacier landing flight on Denali. Very expensive but I've never had anyone say that it wasn't worth every penny.
Denali Flightseeing Tours : View Denali National Park and Mt. McKinley with Talkeetna Air Taxi

Go river rafting in Talkeetna
Talkeetna Rafting: Scenic Floats and White Water Rafting | Talkeetna River Guides

If you can't afford to get a float rating at least go for a flight in a float plane and do a few splash and dash (touch and go on the water) It's a hoot!

Have fun, don't forget the bug dope. If some says "Lets drink till it gets dark" DON'T DO IT!