Great stuff. They will cherish this memory, maybe sooner than you think.
It's exactly what my parents did for me. Yosemite from the time I was 3-4 YO, back when you could just "show up" and get a campsite, to the mid 70's and backpacking into Desolation Wilderness, then on to the 80's where my buddy and I hooked up after highschool and he showed me you don't NEED "backpacking food" and WTF!? you don't bring a flask and a few beers!????
Ya, he taught me how to backpack the right way.
Also showed me how to troll these high altitude lakes with a raft and knock the crap out of the fish.
Oh, the girls got like 2 fish each, we got 2 LIMITS ea (ate the first limit(s) for Saturday dinner). Rainbows and Kamloop Trout up 16 in.
Here's the fishing "rig":
Kidlet took a self portrait:
The dog, Bodie, would NOT leave the fish or rafts alone. He pretty much hung out at the edge of the lake. Crazy dog.