As Campion pointed out, there is a lunar return program, so you’d have to ask NASA. Since you believe we went there already and since NASA is trying to do it “again,” you should have no problem with it. If we were able to do it over 50 years ago then what’s the hold up??
Are you an engineer of any kind? (I am, BTW.) Ever worked in manufacturing of any kind?
There's a whole lot of work involved in getting from "knowing how to do something" technical to actually doing it.
Very little of the infrastructure or production capability built for Apollo still exists today. In a number of cases, you wouldn't want to use it even if you had it, because we have much better ways of doing stuff today. (Example: the guidance system for the Saturn V cost half a million dollars in 1969. Your cell phone has more computing power.)
You will no doubt come back with, "Then why aren't we there already?" Easy: a cell phone isn't a guidance system for a moon rocket.
I like to vacation in DIFFERENT places.