For myself, traveling in from Colorado, I suspect there'll be a balance between what I can bring along and what I'll have to procure locally. But in more general terms, I think it'd be helpful to just list things out -- for planning & perspective, and also just so I can look longingly at that list from time to time.
First thoughts: the regular clothes, underwear, socks. Rain jacket. Hat to protect my head from the sun, since my hair just isn't up to the task. Sunscreen & insect repellent, June-upstate-NY strength. Sunglasses too, damn this fair complexion. My shoes for hiking, and I imagine some other footwear suited for watery activities. Sleeping bag/hammock/blanket, whatever's appropriate to the climate that week. Flashlight. Toothbrush (you're welcome). Trusty pocketknife, as long as TSA lets me bring it.
What else, team?