by Phil » Mon Jun 08, 2015 5:38 am
I'm not sure if this reply will be timely to your plans, but hopefully it'll be of some use to others.
I started my kids at 7 and 9 on their first trip. That was many years and many trips ago, but aside from the usual recommendations for hydration, nutrition, etc, I think the three key thoughts on my experience in keeping kids happy and wanting to keep going are keeping their packs as light as possible (my daughter quickly discovered that sequined t-shirts weigh a lot), keeping their feet happy with proper boots (and insoles) and heavy Merino wool socks, or a good combo of sock/liner, and, before you even begin, getting them properly fitted for a pack that's comfortable. They may not always be thrilled by the terrain, but all of you will be at an advantage from the get go, because you prepared right before you even set out. Maybe above all, even though you might have to push them a little, be patient.
As far as overnight, cut-your-teeth types of trips go:
An in-and-out to Upper Cathedral Lake is always a great trip. The second I would recommend is Yosemite Creek trail head to the Valley. Third would be Porcupine Creek trail head, overnight at Snow Creek, then down to the Valley. Even though the latter two involve some long and serious descents (something they better get used to for hiking the park), the trails are relatively easy, the views are stellar, and there is plenty of water and camping en route, so you do have the option of stopping if they hit their wall before where you originally planned.