I disagree with Matthies 100%. To put on my *serious* hat for a while (take it while you can), allow me to relate the following pieces of advice:
1. The information you learn in law school has a low correlation, and sometimes no correlation, to what you actually practice. With the exception of a *very* few specialized classes, there are almost no subjects that you will not be able to pick up on the fly if you have a decent background.
2. Given 1, you should try and take classes with professors that are good and will engage you, not classes with a subject matter that you think some future employer might find relevant. As with all advice, there is some limit to this- if you want to do commercial litigation, it would help if you took something other than criminal law classes.
3. Given 1, it is also irrelevant what you 1L experience is so long as you gain something from it. I clerked for a state judge in family law division; I'm now doing BigLaw.
4. The relative focuses of the extracurriculars do not really matter for most jobs; they are signals. Law Review (or most prestigious journal) > Moot Court > Secondary Journals > Main Trial Team > Other Stuff Schools Make Up (other moot courts, intramural stuff, yada yada yada). Guess what? If you're applying to be a "litigator" at Skadden, they don't want need to see Trial Team- they want to see Law Review (although you can also be on trial team). There's many reasons for this, starting with the likelihood of seeing the inside of a courtroom your first year.
5. Look, many people's ideas of what they want to do changes during law school. The best advice is real simple- get the best grades you can. Take classes with the best professors your school has. Get on the most prestigious extra/co-curricular organization your school has. Do some interesting things so you don't seem like a dud during your callback interviews and have a few anecdotes to tell. Accumulate credentials (signals) for future employers. But most firms realize that you have a general education, and that you first six months - year will be ramping up on learning the difference between law school and law practice.