Starting from museums to zoo to coffee shops.
When in Amsterdam , must visit coffee shops and hash brownies - an experience in itself. If you like and understand art - its a place with a lot of bful museums.
Amsterdam's nightlife is quite vibrant and happening, bars,clubs,coffee shops, red light district- must experience it all!!
Berlin is full of history - Berlin wall, brandenburg gate, check point charlie etc. For shopping go to primark stores - good stuff,great prices.
One tip - In Amsterdam, avoid dingy & narrow roads - there are chances of you getting mugged.