We took three 8-man crews in mid-July 2010 (three adults and five scouts in each crew). Thus far, it's the pinnacle experience of my adult Scouting career.
We went through a private outfitter instead of the BSA camp to keep costs down and not have to go three to a canoe. We did stop by the camp on our way off the lakes and again as we left Ely.
Our crews started in Snowbank Lake and Lake One. Each crew did 50 to 60 miles afloat, with 2 – 4 miles of portaging over six days as they worked their way up to Knife Lake along the Canadian border.
I'll add a +1 and then another +1 to the head nets and permethrin treatments. Through the day the bugs aren't too bad… Just a fly here and there. When the sun sets, the mosquitoes come out in force. It sounds like a thousand kazoos. Be in your tent about half an hour before sunset or prepare to be eaten. Also, do NOT leave your tent door cracked… not even a little.
Long sleeve poly shirts (like Starter or looser Under Armour) are great. Light. Wicking. Quick drying. With an SPF of at least 30. If wearing shorts, be sure to coat your lower thighs and knees with sunblock a few times a day. That's the only place I ended up burning.
If your portages are all under half a mile, wear cheap tennis shoes with mesh sides that you don't mind ruining. Might even punch holes in the side for quick drains. I took my old lawn-mowin' shoes. Worked perfectly.
Get up and on the water early. Camp sites are first-come-first-served and start getting snapped up by 2 o'clock or so.
If given the choice, go with the heavier aluminum canoes versus Kevlar (I think it's the only option if going through the BSA camp). The boys can be brutal on the bows when trying dry landings.
Light weight is nice, but if you're smart with your portages, this is a trip to take some luxuries on. An extra 10 pounds in the canoe is not noticed.
We bear bagged it, but didn't see any signs of bear (or any other non-human mammals, for that matter).
Rain gear did little good for us. We only had two real downpours. We weren't wearing our suits the first time when a thunderstorm rolled in very quickly. We were all soaked by the time we made it to shore and got them on. The second time we had them on "just in case". The sweating soaked us all from the inside anyway.
If the boys DO wear their raingear, make them wear their PFD over their jackets or do a PFD check at every portage. We lost one life jacket because a boy took it off at a portage and put his rain jacket back on without it. We were two miles up the lake before realizing he didn't have it.
More than anything, let the boys do the work, navigate the lakes, get you lost, and found again. Watching our boys grow over the course of the week was amazing.
Good luck!