Protips:
1. Don't visit North Korea
2. If you have to visit North Korea, learn their laws
3. Obey the Laws. Recognize that it is their country and their laws. It does not matter in the slightest if you think the laws are unfair or repressive. Duh, its a repressive country genius.
4. If you go to North Korea with the intention of spreading the word of your god, expect your god to rescue you, not your native country. If your god does not rescue you, perhaps you did not do a good enough job.
5. (country specific) North Korean government does not like Americans.
6. Don't visit North Korea
Billions of people on this planet avoid being put in North Korean prisons simply by following these simple tips.
Foreigners who do end up on North Korean prisons, didn't.