Scout canoeing, how far in a day

[SSScout]

The trip you have outlined looks very nice. For paddlers with SOME experience. 

Do not (DO NOT) do this without several break in trips.  Ask around, there are sure to be some flat water rivers or big ponds nearby to practice on.  You need some experience to build on. Learn emergency stuff. Paddle skills come in practice.  J stroke wasn't made in a day.  Find your local Canoe Cruisers Club, a national loose amalgamation of paddlers, enlist them as Canoe Merit Badge Counselors (!).  Fall trip could work after summer camp Canoe MB earners.  

Are your boats to be rented or owned locally so you can use whenever?   The CCC can help with this.  Maybe your local Scout Camp has boats to borrow, cartop racks, trailer for holding 8 at a time?  

""Is it so nice as all that?" asked the mole, shyly...

"Nice? It's the only thing," said the Water Rat Solemnly, as he leaned forward for his stroke. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about in boats."

"Simply messing...about in boats -- or with boats... In or out of 'em it doesn't matter. Nothing seems to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not.""