Non-Tourist things to do in Barcelona and Madrid?

Hello :)

Me (student, 20 years old) and my best friend (student, 19 years old) are going on a trip to Barcelona from the 15th to the 19th and then from the 19th to the 23rd to Madrid... and I have read a couple of tuorist guides so I have all the tourist attractions pretty much under control, but I was wondering if anyone had suggestions of others things to do while I'm there! :)

Thank you so much in advance!

Hi,

In Barcelona, Gaudi Gardens is Perfect, you must visit there:

http://www.pbase.com/bvaez/image/45007669

For going out at night: Razzmatazz Disco (Almogavers Street), the Gracia neighbourhood for having drinks (not for party animals), the Born neighbourhood for cool shopping, food and drinks.
During the day: chill out in the "chiringuitos" on the beach of "Mar Bella", walk through "Ramblas" walkway and "Passeig the Gracia", get lost in the old town neighbourhood of "Ciutat Vella/Barri Gotic"...
Barcelona is the best city in Spain (in Europe, I would dare to say) by far!
Have a great time in B A R C E L O N A ! ! !