Invest in some of clothes made specifically for hiking - you can wash them in your room and they will dry very quickly. Also look for the little small packets of soap to wash them with if you don't want to use bar soap. You might bring a couple of hangers, some hotels don't have hangers that detach from the rod so you can hang in the bathroom. Bring all your old underwear and toss them when done (my mother-in-law does this and travels with just a back pack for 2-3 weeks). Have fun, sounds like a blast.
Went to Paris and South of France two years ago and found these shoes before going. They were wonderful! They are very light and you can buy several colored tops which solved my dilemma of having shoes to match my outfits! They are a must! http://www.onesole.com/
They come in all different styles and heights. They are fun.
Similar packing for 2 wks on HD trip. Roll everythink tight. Have a great trip