Hi Erik make sure you leave about 2 weeks for BARCELONA, Northern Spain. Thats only if you want to party on the beach, in the clubs till 6am then later till noon, followed by little adventures around the stunning-looking city with hotter people and palm trees and lots of culture.
Party tours, are kind of for people who cant just find a party. this also means you will end up sticking with the same people for the duration, like cattle herding.
This city, Barcelona, is such that you can go and get involved. Good starting points include the kabul hostel in Plaza real, to go in and make yourself some mates to hit the streets with. The beach, in the evening, has groups with guitars, people just hanging out over the summer, festivals galore, as you say "great and constant nightlife".
To get a little look, have a look at www.way2stay.com, which is mainly holiday apartments, but includes city information, areas, maps so you know where you want to be. It also has a guide to Amsterdam and Paris.
I really recommend not getting roped into Party tours. Book some well-placed flights around europe, do some research find some good pre-club bars that you can socialise in, i would book accomodation but not for the whole time, e.g. if you're staying for a week, book for the first 3/4 days and then let the wind blow you wherever........ and with a good attitude you'll be able to get to the best parties without going on a bus. I bet those tours take you to the touristy house clubs with no soul!
bottom line- if you want real adventures, leave enough free, "haven't a clue what to do/where to go" time and you'll figure it out.
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