Another vote to spend at least 3 more days doing a land portion. If you have time, I recommend at least a week on land. We spent a week on land (driving ourselves) before our Radiance southbound and it was not enough. We went back a few years later and spent two more weeks on land, no cruise. The cruise was really nice and we enjoyed what we saw but if you truly want to see Alaska, you need to spend time touring the interior.