National Forest, BLM opencarry is perfectly legal unloaded. If it's an unincorporated area then you can carry loaded. State parks, no carry (can't quote anything here but I do remember that being the case).
I advise reading through the publications and flyers here on the forum, they're very informative. Besides, a little personal research can give you knowledge of all kinds of laws you wouldn't otherwise ask for or think to investigate
Welcome to OCDO, have a pleasant stay, and remember... always know the law. Unless you're like me, then just ignore anything the government says and wait to be thrown in a torture chamber.