Greg's info on routes and wind is spot on.
Distance: ~3 miles the first day, ~7(?) the second. My route the second day was all off trail across the dunes, so I'm really not sure how far it was. Those dunes are tough hiking, so it may have felt farther than it was.
Gear: Oh man... I've tried to keep myself clearer of gear junky-ism than in the past, so I don't have a detailed spreadsheet. BUT my main items were
- Pack: MLD Zip (1st gen)
- Shelter: GG The One (1st gen)
- Bag: WM Summerlite + BMW Cocoon Pullover and Pants
- Pad: BMW Torsolite + GG NiteLite
- Cooking: Homemade Heine keg + alcohol stove system
- BPL Merino Hoody
- RailRiders Weatherpants
- Patagonia Houdini
- Mont-Bell Thermarest Vest
- Patagonia hat + OR gloves
- Montane Featherlite pants
- Misc: Firestarter, hydration bladder, headlamp, etc.
Not sure exactly what it all weighs together (gasp! I have a system that's light and works well for me, so I don't overtly think about weight anymore) but a base around 7 pounds for temps down to 10F, possible light snow, and high winds.
You can download a park map online that lays everything out. By combining the trails with off-trail travel (the best kind) through the dunes and the alpine wilderness area, you could plan a helluva trip.