He'll pick up all of those items and try a berry, trying to determine if it's safe to eat. If it doesn't seem immediately suspicious, he'll scoop some handfuls into his jeans-turned-bag. His coat has probably also become one at this point.

He'll try following the animal path, since if they're trying to get to the lake, it probably means it's drinkable, right? If he does that, does there seem to be a relatively safe (for an athletic person) way into the caldera and back? He wants to touch that water, damn it.

If not, he'll head down south to the closer river spring to get some water into his bottle and into himself, then head toward the man-made structure to the northeast, keeping an eye out for danger or anything suspicious as usual.