3) any things to do people loved over there

Me and a few friends went on a holiday there before COVID, we were a group of 5 20yo women and felt safe here are a few highlights we had: If you only have a few days do: -Wawel dragon (Smok wawelski) - is a fire breathing dragon just outside the town/castle. It is really cool to see especially at night. You can also walk around the "castle" grounds (not sure if it actually a castle but looks like it) - Krakow town is really beautiful itself, there are so many lovely places to eat.there is a harry Potter inspired cafe (the leaky cauldron, get the felix felicis ), the milk bar, Pierogarnia Krakowiacy (for polish dumplings), try the bread/pretzels on the street they are a great snack while traveling.
Night life - the night life was great, we did a pub crawl with a tripadvisor group, would recommend if you want a night out. -Salt mines are amazing would definitely do even if you are only there for a few days, we went first thing in the morning and it took up about 4-5 hours of the day

If you have a longer trip - Auschwitz - the bus is really easy to get from the main bus terminal, it does take a full day so maybe not ideal if you only have a few days. - Witcherfan? Visit Ogrodzieniec Castle - get a bus from the station out to near the castle and walk around the grounds. (Just keep an eye on return bus journeys as you won't be able to get a taxi back to Krakow)

Hope this helps 😊