Why take a ferry when you have so much time to really enjoy a drive to alaska? as pigman1 mention icefields, jasper and that area is beautiful
then drive alaska highway. when leaving alaska take the top of world highway so as not to go on same highway twice. then can come out at whitehorse and down to skagway. you have the prefect setup to take road trip. so much to see which you want see if take ferry. we made trip in 2007 and took three weeks after we went into canada from washington then came out at Montana at glacier np.
regardless of what you decide enjoy.