nocmclean
It's been a while for us, but we found this website warsaw in your pocket ** and the downloadable version to be a great guide for what to do and where to go. The long "Royal Way" (the street name changes a few times) is a walkable tour of the core tourist area, with tons of restaurants and ends in the restored Old Town area in the north. You have to go to the Museum of the Warsaw Rising to see how it was restored after the whole city was razed during the war. Also various Holocaust sights and the Museum of Polish Jews. Chopin concerts around town and the Lazienki Park.
A lot depends on your interests, and not all of it WWII related. The town Czestochowa is a significant cultural and religious shrine reachable for day trip.
** In Your Pocket has similar info for many cities in Europe, so its worth knowing about.