Krakow - A Hidden Gem
Krakow is by far one of my favourite cities on the planet. I was there in mid-to-late August and the weather was sublime. It is spectacularly clean and an incredibly beautiful city, with locals to match ;) The sight seeing is fantastic, wawel castle right near the lake is stunning and the Old Town Square is a must see in both the sun and moon light. Apart from being easy on the eyes, Krakow is jaw-droppingly cheap - paying between $2-3 for a very filling meal of Perogi! Krakow = 10/10
Insider Tip:If you're a bit of an adrenaline junkee, there's bungee jumping from a crane not too far from the Old Town Square (10 minutes by bike) which was an awesome experience and is only 175 zloty ($60 US). My other favourites were walking around the castle and seeing the State Rooms and the Armoury (Get an audio guide - it's worth it!). Auschwitz was a moving experience and a must see, you won't laugh much but you will see a side of history most people don't. The Salt mines are incredible as well!