I don't believe in the 'moon landings were a hoax' idea/theory.
But in any case I was under the impression that various satellites were to go back to the moon starting at the end of this year and into next. One
Japanese mission (if I recall correctly) will orbit and map the entire moon in fine enough resolution to show all the landing sites etc so hopefully
this will put the idea to bed once and for all.
(....ok for almost all of us.....till the hoax story gets moved on and someone insists - with a straight-face - that the hoax was so complete that
even the trails and footprints were faked!

)
The most plausible part of the question was (for me) always the radiation question but I think that has been satisfactorily answered in relation to
the moon.
However as far as I can make out with today's tech it pretty much rules out any trip to Mars (unless the agencies and people concerned are prepared
to take an extremely risky gamble heavily weighted against any success).
Unless someone knows better and would care to say so?