I do sometimes bring a Snickers skiing or snowboarding, inside my shell but outside my insulation. Pop-tarts, Nutty Bars, little peanut butter on toasted crackers. They're things I would consider eating even if I wasn't in the woods/on a ride.
Beer is good too and if stowed properly won't freeze.
Bourbon, Rye, Scotch, Cognac, whatever your choice, keep it near your cigars.
Also, I make breakfast at home and eat it on the two+ hour drive up. Keeps me from having to bring/eat as much throughout the day.