Via Water, Kodiak
Ferry service runs almost daily between Homer and Kodiak in the summer months, rotating between the Tustemena and the much larger Kennicott. Check their website or call to check on schedule as it changes from month to month. And then double check a few weeks out to make sure it is still as scheduled.
Kodiak is on the Alaska Marine Highway system, and the ferry Tustemena will bring both you and you vehicle from Homer or Seward.