Never driven up. From Florida, it will take a good bite of driving. A month might slip by pretty fast, might be able to do it I would guess. Lot of sights to see in Canada on the way, I'm sure.
In 2010, we got to do a week camping. My wife & I have flown up to be with our son & his family. We have gotten to do some exploring & camping with them while visiting.
:C Clicky :C for a few photos & report of these trips.
We haven't gone to Seward yet, but they have cruises out from there, as well as Whittier to see glaciers & wildlife. From Seward, they go to larger ones.
We enjoyed a day cruise on the Prince William Sound (really a Fjord) from the port of Whittier. The food was great. Our son & family have also gone on one from Seward.
Hope something in the above will be so some help in planning.