Some starters might be:
Rain gear (poncho or umberella)
FAK
Some cash
Phone card
Emergency Numbers
Duct Tape
Flashlight
Lighter
SAK or Multitool (with scissors and file - for problem nails)
Needle and thread
Water
Sun Block
Something to eat (No idea what would work for your wife - cliff bar? Pwer bar?)
Gloves
Dust mask or bandana (or both)
Extra glasses if needed
whistle