If I had plans for a trip in National Forest land, I'd still be going. If you did run into a ranger, what's he gonna do: slap on the handcuffs? I'd be polite, but not necessarily turn around and head back to the trailhead. And if I encountered a volunteer, I'd say, "I appreciate what you're doing, but the FOREST isn't closed; the USFS is." That's a bureaucratic issue resulting from a few jackasses in Washington saying, "If we don't get our way, then everybody will suffer the consequences." That's not governing in a responsible manner; it's pouting and being obstinate.