Perhaps you could be more specific about the school to get more replies as to the committment which was required by that school in the first two years. I also have no idea about what is required when you're a member of a lacrosse team....but that might be a good interview question to ask if you get to that point.
My pharmacy school (UCSF) had NO althletic teams.....but, we had lots of time during the first two years for other stuff (I was in SF....it involved lots of liquor, free time, late nights, medical & dental students, etc....)