I had the best time on this adventure. It says wilderness and oh my god you are in the wilderness! It's 6 days without anyone else or any support, kayaking round with all your food, tents and clothes.
This is particularly important when you remember that even though all the pictures are sunny, Alaska is very very very wet.
The paddling was quite tough, I didn't do any prep beforehand but one of the team who "has never been to a gym in his life" managed it, and while it was really hard work it made the experience so so much more than it would have been otherwise.
In terms of kit you don't need a huge amount.
You don't need hiking boots and there wasn't actually any hiking involved at all. No matter how waterproof you think your raincoat is, you will soon learn that it isn't. You could probably do with bringing two with you. One for the day and one for the evening. I was fine with 2 base layers and 2 tee shirts for the full week, just wearing a synthetic coat, raincoat and a rubber raincoat provided by the team. Two pairs of trousers, lots of socks and genuinely waterproof trousers as well.
Overall a genuinely amazing trip. I'm writing this the day after it finished and I'm already wishing I was back in the boat with sore shoulders pushing the final 5 miles to the next camp site, a cup of tea and an enormous dinner. Would 100% recommend it but you've got to be really ready to rough it!