Kodiak is a great place to go fishing, for a week or so. A couple of times I flew over from Anchorage to Kodiak, the town, the took a float plane oner to the village of Karluk to fish the river of the same name.
Kodiak has some great history, as it was the first capital established by the Governor of the Russian America Company. After 4 or 5 years they decided to move the capital south to near where Sitka is now located. This was due to two reasons as I understand, the weather in winter time Kodiak can be brutal, and the governor, Lord Baranof wanted to send the company fur trappers farther south, toward Northern California .
But a couple of days in town and a drive out the roads would probably be enough for me. I never considered taking our RVs over to the island. The ferry ride would be fun if the weather is good, and passenger fares are very reasonable, leaving the RV in Homer for a few days. Kodiak is well worth seeing IMHO.