I don't think there's any good substitute for reviewing the laws of wherever you're going to be. There's just too much variation, and there's no "one size fits all solution."
And some places it won't be just a matter of paying a fine or getting a ticket. Some places it will be a felony. And that would mean arrest, bail, legal hassles, lawyers, expenses and perhaps a loss of the right to possess a firearm.
Check out the books available from Bloomflield Press (http://www.gunlaws.com/
). They may have something that can help.