I am going to commandeer a Walmart with a core group of people for a few reasons.
-food, water and shelter
- ammuntion and access to additional firearms (if my 30+ aren't enough)
- enough junk to make fortifications
- roof provides a high ground for repelling zombie assaults
I could pack up everything and be at Walmart in less than 10 minutes. I would let people in if they had a useful skill. For example, I would let fat people in to be bait while setting zombie traps.