Thanks for the info guys. I'm sorry that I haven't mentioned it is my daughter, not my son.
Len, the last time I backpacked was two years ago in the Uintas. Before that I have been to the Uintas twice and the Wind rivers once (all these trips were 30 miles plus) but it has been several years. I think I have the respect for altitude and a full pack that Jim mentioned, but I know the selective memory kicks in when planning for a trip like this
This year I will be investing in some real nice gear under the advice of a neurotic brother-in-law who I would classify as an elite or close to. He does 50 milers every year. So I should be fairly light on this trip.
I am seriously reading your comments. I have been looking at the trail descriptions on nps.gov and can see that your mileage is correct, easily 20+ miles including north dome. I think I can make it, but we'll have to see with my daughter... We are going to do a big day hike (10 miles) plus an overnighter with full packs to get ready. After that I'll have to decide. If she struggles, I think porcupine creek is definately the option for us based on your info. Also, thanks for the tips on the specific camping spots. If we stick with Olmstead, sounds like Day 2 will be the key for us ... if doing well, go for north dome, if not, lehamite creek. If really struggling, bail out at porcupine creek trailhead next day. That is a good backup plan that I wouldn't have thought of, thanks.
Oh, by the way we have some extra motivation, as we are being dropped off on the way to visit in-laws, so this trip gets us out of 3 days of visiting in-laws