I would gather the needed supplies and move our group (core group is 3 families-15 people, 9 who can shoot, 3 who can load) up to the top of a steep hill near our home, only 1 access road with a clear 360 degree view. We already have livestock and gardens, there would be enough room to set up rv's and defenses. Only the road itself is easily negotiated on foot and only about 12 ft across. A nice bottleneck that could be squeezed a bit more with minimal construction. My brother has a couple of ultralights, if we needed to gather some extra supplies.
Directly to Wal-Mart. You could easily shore up the entrances and loading docks.. Plenty of non perishables. Guns , ammo and camping supplies along with anything else you could possibly think you may need.. One could stay here for very long periods of time and bring in other non infected people. Wal-Mart also has a very well stocked pharmacy...