sunscreen, GU/carb-boom/powergel or similar lightweight energy gel, probably 1 pack per 5-10 miles, compact tire inflator, small bottle of tire goo incase you pick up someting that pops a hole, small first aid kit with tape, bandages, band-aids, antiseptic, tweezers, alcohol pads. That's all I can think of at the moment.
My husband used to ride downhill and I always made sure he had these things before he went out. along with a snake bite kit, but I don't think you're going to need that!
Have fun!!
