I think I'd get myself to my family's farm over in Oklahoma. Sure, staring at the ass-end of a horse for the rest of my life doesn't sound like fun, but neither does starvation.
You'd better get there quick. While many people wouldn't have the common sense to seize farms and start raising subsistence crops, you'd still have raiders blowing through your area.
Would you bring some friends along, to help make the farm more defensible?
Remember in the whole "Dies the Fire" series, the isolated islands do the best. I'd flee there, only because they're more accessable.
Large islands with a wide variety of resources. The small San Juans might not have such a wide variety of food. Never been to the San Juans myself, is there deer? How's the fishing?
As for me, the first thing I would do as soon as I realized firearms don't work is get a bunch of my friends together and raid any location that would have bows and crossbows (along with the obligatory arrows).
While raiding for useful weaponry, I would take as many energy bars as huimanly possible (I would gut Sports Authority). Would I have to use strongman tactics? Sure, but this is the end of modern civilization we're talking about here.
At the time I was living in Maryland, so I'm not entirely sure where I would flee. My family doesn't have an ancestral farm. No, my family owned part of the Shipyards down here in Virginia, but then it was seized by the Northerners. That's when my family trekked West to the Seattle area. So fleeing to a farm is not an option.
I myself don't have horseback riding abilities, so this journey to wherever is going to have to be made on foot. Given our lack of mobility, we'd probably have to join with a larger group. I guess mine would be the life of a mercenary initially...