I'll confess I actually didn't much care for salmon as a kid....I tried it a few times and couldn't like the mushiness when its cooked in tin foil. This recipe makes a crispy fish outside, and the hearty veggies and spice make it really good.
I'd think this recipe could work well with fiddleheads either in place of or in addition to the okra. If you knew in advance that you'd have salmon in camp, the ingredients wouldn't be too difficult to bring along in a cooler, and the cooking itself is pretty straightforward.