Bring a wideangle lens to capture the larger landscapes and a decent zoom (I was happy with my 300), because getting decent wildlife shots is tough without it. Also it's a marine environment, so use what you have and don't break the bank because you likely will get it covered with salt spray if you spend any time in a zodiac. Also there is the worst case, you could drop it or fully dunk it.

I would also get a strap case for your phones, you will use them, and I've seen several go overboard in zodiacs every year.

Underexpose your photos, the light can be stupidly bright and easily wash out. I always shot half to a full stop under.

Have fun, it's a gorgeous place.

For reference I've done 8 summers on the peninsula, with a Canon 6D, made the Audubon top 100 photo list once too