Since I work at one, I know the first thing I’d do is break all the kerosene canisters in sporting goods, cause a fire and that alone will burn the entire half of the store since Auto with it’s oils, Lawn and Garden and Toys will happily fuel that fire too.
Then I’d go to hardware as the fire develops, taking sledgehammer and hatchet that they sell and go to work breaking everything.
Forget looting, I want to destroy capitalism’s toys.
The rules don’t state that I have to stay in the Walmart. I can use the fact I’m alone to gather materials to create maximal destruction in adjacent areas.
Oh course, I’m not alone out there so I would face resistance, but it still gives me the best chance of maximizing the posited utility function.
(Except I’m not a robot that would turn people into paperclips. I’m a person that doesn’t want to hurt anyone, and don’t see any personal benefit in vandalizing a Walmart either.
I’d probably just eat myself to death.)