Traveling by Ferry .it gives me4 nights in Juneau. I think this is too long. Should I forget it. Flying into Anc taking train to Denali. Also want to take train from Anc to Seward. Should I just hang out around Seward,really don't want to rent car.

Yes. No.

Or ferry to Juneau and arrange an open-jaw ticket on Alaska Airlines, JNU-ANC-Home.

Hanging out in Seward doesn't take a lot of time.

I'm not sure how much time you have total, but we did a ferry stop in Juneau which was for three nights. We did fine with that much time, despite the constant rain. If the weather had been better we had lots of plans, including an all day "Tracey Arm" cruise and a trip up to the top of the mountain there -- which was encased in clouds our entire stay.

where did you stay and whay did you do?

duh:

If you want some ideas then take a peak at my Alaska Trip Report Part 2.

Scroll down to my time in Juneau.

Happy Travels,
Oaktown Traveler