Get involved in activities you genuinely care about, not those you think you should because they're typical "pre-law" activities.
-Megan Barnett, Dean of Admissions and Financial Aid, Yale
"Professional joiners" are a turn-off.
-Elizabeth Rosselot, Director of Admissions, Boston College
There are lots more quotes like these, can't hunt them all down right now. And, in general, you can find lots of quotes from admissions deans that generally disparage the value of anything law related before coming to law school. For example:
I prefer to see business related experience rather than work in a law firm. In consulting and investment banking, for example, the demands on the person are great whereas the responsibilities in a law firm tend to be less challenging. Thus, the former carries more weight.
-Don Rebstock, Associate Dean of Admissions, Northwestern
These are just a couple. There's lots more like it. And, you've got to remember. This is just what they're willing to say *publicly*. You've got to assume in private (i.e. in closed doors at admissions time) they are even more critical of pre-law activities.