Well, now you can drive to Whittier. A couple of years ago, they paved the track area and now there's a one-way road (direction is controlled by a schedule) that is shared with the railroad. It just barely fit our fireboat on its trailer for the trip in for the SAR event we went there on. I didn't care that much for Whittier, but the Passage Canal and Prince William Sound are always awesome.
I much prefer Seward, it's an easier drive. Prettier, too.