Trip to Europe over winter break, advice?

[Jeffmet3]

Hey,

I'm a sophmore in college, and this winter break, me and two friends are going to Europe for 21 days.

We came up with a very basic itinerary, and bought plane tickets, but other than that, we're really not sure what we're going to do, and where we're going to stay. Since there seems to be a decent number of Europeans and people who've traveled I figured I'd post here and ask for advice on what to do.

Here's what we have.

Plane ticket from JFK to Paris arriving December 21st
Plane ticket from Rome to JFK arriving January 10th.

We're going to buy a Europass to for unlimited train travel in Europe.

Basic Itinerary for cities is. (subject to possible change)

Paris -> Amsterdam -> Berlin -> Munich -> Zurich -> Venice -> Rome.

Gameplan is to party and get [censored] up every night, and go sightseeing during the day.

any and all thoughts are appreciated?

thanks

jeff