I study Criminology, which i know is not LAW, but its close. Ive just completed my first year, and i managed to do so pretty well, despite going clubbing twice a week, and missing a few lectures. SO, as long as you have yor priorities, and set aside time for work, i see no reason as to why you cant have an active social life, whatever you class as one!
Dont stress yourself out in the first year, youl probably regret it. University is about experience too, and employers are begining to realise that a 1st from uni, although being sososo good, may mean that the individual has dedicated too much time to work, and not enough to experiencing life.