1) He's against the present interventionist foreign policy. he has been extremely clear about that for years.
2) He's in favor of states being left to decide for themselves about drug legalization. If Texas wants to support the legalization of pot, his position is that that is up to Texas voters.
2a) Paul constantly makes the point that the war on drugs has been a disaster, and constantly hits against the mass incarceration system we have today. He makes the point non-stop. He points out the unfairness of our current system, such that it's putting black people in prison for the same things white people are getting away with (drug use).
3) He's in favor of states being left to choose about both abortion and gay marriage.
4) He is not in favor of any federal legislation to outlaw either abortion or gay marriage. Paul has said he would not attempt to change present laws on abortion.