Chaos is going to Europe baby!

[Chaos in 1983!]

From July 14th to August 5th, three of my mates and myself are going on a backpacking trip throughout Europe.

We´ll arrive on July 15th in Madrid, and then head on to Barcelona, Marseille, Nice, Monaco, Milan, Lugano, Zurich, Munich, Berlin, Hamburg, Amsterdam, Brussel, London, Paris and back to Madrid...or something on that route since we haven´t really decided yet, and I also think that´s too many places for three weeks, and i don´t think we should rush things either...

We´re planning on getting Eurail passes to move around from country to country. And we are using the Eurostar to get to london from mainland europe and back again. About this, does it get too crowded during these dates? should I make reservations?

This one goes to dani, on train, how long does it take from Madrid to Barcelona? I also need to know how long it takes to get from Paris to Madrid?

And what better place to find out what to do and where to go in Europe than JW?

So, I need to know where to go...apart from the sightseeing guide. Were to eat, automotive related sites/museums or events during those dates, where to PARTY! ...I would have no idea where to party, for example in Monaco, I bet it's ultra expensive to party there...right salegosse? or London?
I would also like to ski again, I haven't done that in like 10 years, I suppose I could do this in Switzerland, right TT?

Thanks a bunch, any advice will be greatly appreciated!...I hope I´ll be able to meet some of you guys during my stay in Europe.