Kids are great because they are seeing everything for the first time. But, remember, they don't have the stamina of adults, let alone teenagers. @
Eric Christensen my advice would be this...give them a definite payoff at the end, and mini-wins during the hike if possible. What do I mean?
Payoffs - Waterfalls to jump in, lakes to throw stuff in, rivers to float stuff in. I know that's a lot of water stuff but the point is just somewhere that is memorable. Adults love grandiose views, large meadows, and amazing foliage but kiddos want something interactive. So, if the destination is something more grown up, make their version their size.
distance - one mile is great because it's just far enough to feel like they've gone 'forever' but not so long that they're exhausted. if going further break up the hike and have mini-things to do. multiple little breaks, depending on the age, is the best way to break up the distance as well. Fill each break with a snack and something to drink.
Food - always bring plenty of it. We adults have plenty of stores to get a little hungry before we eat, but most kids don't. That's why so many trips turn into 'hangry' monster mishaps. Frequently give the little ones something to fill the tank and don't be shy with the water.
Toilet - your boys are at perfect ages to poop in a hole. It is different. It is not what they're used to. They will think that is the greatest part of the hike! The biggest part is teaching them to do it at the appropriate distances from water, camps, and trails. It's also the perfect opportunity to teach LNT. we always (at least try to) carry out our TP or burn it in the fire. As gross as it sounds it's the perfect way to LNT. I'm sure if they love peeing on a tree they'll be fine with the hole.
Tents - they provide a lot of 'critter comforts.' the noises can be explained but the illusion that a tent will protect is great. BTW, if in black or grizz country, please keep everything that smells out of the tent, i.e. food, chapstick, deodorant, etc.
Fire - One of the best things about camping is the fire. It is comforting, entertaining, and soothing. Overnighters are much easier to do when there is the comfort of the fire.
Backpacking - don't have them carry too much! That is the hardest part because that means you have to carry that much more. The 6 year old can probably carry his sleeping bag, pillow, and a little something else. The 8 year old a little more. Then all the other things above really make it fun.
I am really excited for you to backpack with your little ones. And, just so you know, all this info is stuff I've learned over the years from camping, reading, and passing stories around the camp fire. Have fun and give us a trip report when you're done.
Salud!