This is going to sound kind of paranoid, but my best friend had a friend who ended up in a tricky situation when she was on a "visit the in-laws" trip like this. I don't want to get into details but it is a very very scary story.
I am sure that your husband is a wonderful person (if not, you wouldn't have married him

) and the family members you have met or talked with are also good people. However, please remember that some countries have different views of women's rights/proper place in society. Plus many countries don't really have warm fuzzie feelings about Westerners. I would expect that you do not know the entire extended family, neighbors, etc. and they may not be as good people as your husband is.
Please try to always keep your U.S. passport with you at all times and be careful. Female intuition is a powerful thing, so if you feel weird about anything, don't ignore that.
I'm sorry, I didn't mean to be a downer. I think that you will probably have a wonderful, exciting trip that you will share with your children and grandchildren one day.