Fire Starter - Always include a fire starter with the matches. Always. There are times you will not be able to start a fire without it. And it is far simpler and safer than trying to siphon gasoline.
First Aid Kit - A first aid kit sized to the trip is a must. OK, OK, so it's a small trip. However, something is definitely better than nothing.
Sun Protection - Sunglasses and sunscreen are a must. Zinc oxide is the ultimate sun block.
Flashlight - Headlamps are preferred because they free your hands for other tasks. And do not forget extra batteries.