Tara,
As others have mentioned, don't forget to set aside a little time for Jackson, WY and Cody. We just did both parks last summer for the first time, and we appreciated Grand Teton much more than YSNP.
We prefer to camp at state parks and enjoy having spaces more to ourselves. That's what GT felt like to us. You knew there were tons of other people there but it just doesn't seem any where near as crowded as YS. I would recommend if you're a fisherman, get yourself a license for a day and spend an afternoon drowning some worms with the beautiful Tetons set as the backdrop. Very relaxing!
I also recommend that if you have kids with you build in a down day in the middle of YSNP. You will spend a LOT of time driving from one attraction to another and after a few days, the kids needed a day of not riding in the Jeep. They just wanted time to read, play catch, and relax.
And I would also save GT until after YSNP, again just much more relaxing and you'll leave with images like this in your mind...
Doug
