I've hunted three times on the vessel based with HOC and once out of a cannery on a PBS hunt.
Everything about Kodiak is pretty awesome. The deer are stalk able and a beautiful deer with the double throat patch. As for tactics, on the south end where HOC operates, it is much more open, I would look to find funnels and get in front of moving bucks. On the north end, it's pretty thick. Calling works much better there. The deer just seem a little more naive than your typical whitetail or mule deer. The venison is fantastic.
As for gear, you'll want a good water proof hiking boot. The terrain is pretty steep. Good rain gear is a must as moisture in the form of rain or snow is a guarantee. A waterproof glove is a good idea for going from he boat to the shore. Dress in layers.
Bears are certainly present and have always seen them. I've had them as close as 20 yards, but no one I've hunted with has ever lost any meet or been charged by a bear. Take the bear spray because it will make you feel better.