When I travel to places affected by deeply traumatic events I make it a priority to visit the museums preserving their memory.
It's not always easy but my world perspective and respect for peace is increased and understanding of events greatly fortified.
Auschwitz-Birkenau is not a fun place to visit but it is very important to humanity to witness what happened there, and if you have the chance I highly recommend it - for the sake of those who died and for personal growth.
It's around £/€/$25-35 for a half day trip from Krakow to visit both sites and the museum have just doubled the number of individual passes available so you can visit for free without a tour much more easily. There are multi-lingual guides available on site if you'd like to add a tour when you get there, the earlier the better.
There were many children visiting with their parents and people from all over the world. Public buses go from Krakow and on a tour it will start in Krakow around 9am and drop you off around 4pm.
It might seem an undesirable thing to do while you're on holiday but I believe peace is something we can benefit from remembering the cost of.