Greetings to a fellow Idahoan.
I like the Garden View rooms as I think that they are quieter. That might come in handy with your little ones.
http://allears.net/dlr/acc/g_gc.htm Here is a link to some room pics. They are basically regular hotel rooms. You may want to ask for bunkbeds if you think your kids would be okay with that -- it makes the room seem a bit roomier, especially if you are going to use the pack n' play. Or you may want to be sure that you
don't get a bunkbead if you think that they are still too little.
They have storytelling in the lobby that your little ones might enjoy at the end of a long day and lots of other activities. There is a character breakfast at Storyteller's Cafe. It is very nice to just walk to the Grand Californian when your little ones (or you) need a break. And it is a beautiful hotel and has wonderful ambiance.
Enjoy travelling in the off season while you can because as your kids get older it won't be possible. After years of travelling off season my 4th grader informed me that it is too hard to make up the work and that he doesn't want to go during school. The responsible Mom part of me is happy but the Disney Mom part of me is sad.
Enjoy your trip!