Agree on the cattail roots, if you just boil them. I've had decent results after washing well, parboiling and then roasting. Yes, it's a hassel. I like the little center part at the base (above the roots)better.
I've had mixed results with the mussels. I usually wash them in clean (boiled) water and the roast them on the coals till the open.
I'm with ya on the "man can only eat so many greens" thing. From what I've read, nettle has the highest content of nutrition of most wild greens so I tend to snag that first.
When it comes down to it, it's tough to get that "hardy, stick to your ribs" sort of meal when foraging. Starch and fat are tough to come by this time of year. It's one reason I'm big on the bug thing. Protien is a decent substitute
Figure fours take some "getting the hang of" and require a nice, flat, square edged rock or split log to keep it stable. My cub scout den got their whitlin' chip badge by making the figure four. They had great fun walking the little stuffed rabbit into the trap while making terrible sounds of distress.
I learned the paiute deadfal from McPherson's books. I actually got good enough to catch mice with a figure four.
Another thing my scouts enjoyed learning was "no utensil cooking". They did fish by packing it in clay and burying it in coals. It works well. Bannock on the stick is another favorite of theirs.
One of the activities that brings the most pride and confidence is friction fire (bow drill). Get 'em the right stuff and help them set it up well and it's not hard for a kid to get a fire in under a minute.
Most important thing is to get them out there. I get more reward out of teaching the kids than I do actually doing it myself.