Couple other thoughts:

1.  Invest in a portable depthfinder...or better yet convert a regular depthfinder into a portable for even more lightweight option.

2.  Make sure everyone has a rod holder so you can troll as you paddle.

A depthfinder will help you stay on the right depths for the fish you want to catch.  How deep?  Experiment until you find the depth where you catch fish and then use the depthfinder to stay on that spot or find similar spots.  You may not actually see any fish on your unit but once you figure out where they are a depthfinder keeps you in the productive zone.  It'll shorten your learning curve on fishing your lake by a considerable amount.  13-year-olds are not known for their patience...as I'm sure you are well aware!

Trolling as you paddle makes a lot of sense.  First and foremost it gives a kid more reason to paddle than just "we need to get to...(wherever)"  If you are trolling and catching the occasional fish, paddling seems like a lot less work to a kid and he'll be more willing to stick with it.  Additionally you'll learn a lot about what's working or not working for lures and depths before you even get to camp.  Keep your depthfinder on as you go, of course.  Finally, trolling offers your kids increased odds of catching a real lunker that could gut-hook them on canoe tripping for life.