During a long walk home, you may want to keep the Get Home Bag as light as possible. A look an Original Mountain Marathon OMM kit list might well be worth looking at, if you want to move fast and light.

http://www.planetfear.com/articles/The_planetFear_2012_Mountain_Marathon_Kitlist_1129.html

I would also pack a solar umbrella especially for urban areas. Even on moderately warm sunny days the solar radiation will take its toll or how far you will be able to walk. Hiking in warm wet weather is less than ideal when using Goretex rain shell.

http://www.euroschirm.com/schirm/Swing_handsfree/info.cgi?session=RWPQat49hnA6H&sprache_land=usa

Don't forget to pack a wide brimmed hat, sun glasses and some walking boots/shoes, socks, Vaseline and foot blister kit.

A small pair of good quality binoculars i.e 7x25s could also prove to be very handy to recce your route forward.