Matt,
thanks for the prompt and informative reply :-)
Your advice is what I was hoping for, I just wanted to get someone to confirm what i thought I might do anyway. With regards point 1, is it doable to drive up early on a Saturday morning from Portland, find parking and start the hike around 8am or should I get up there on a friday afternoon/evening and camp at the trail head? Not too sure how crowded it will be.
Will the lunch counter likely be covered in snow or will I be camping on stone? I assume we'll need sleeping mats either way and if so do I need anything special to keep warm on the snow. My bag is a 20* bag and my sons is 35*. I've never camped at altitude and my son and I are excited to do this. Just bought a nice REI half dome+ in the sale.
I'm sure we can follow the tracks but will also take a map and compass, thanks for the pointer about REI, I've got one where I work so will go find that map.
thanks
Rob