You don't ask easy questions, do you?
College is interesting. It will broaden your horizons, let you meet new people, and will give you more control over your own education than you've probably had before. No one will hold your hand or make you go to class.
Generally, the college or uni requirements consists of going to lectures, doing the assigned work, and writing exams. The thinking part is not optional if you are serious about learning and improving.
In reality, most people at college do a mix of the following, in varying degrees: get drunk, go to lectures, sleep, attend labs or write papers, do homework, and whine and complain about the amount of homework they have yet to do.
Do what you are interested in, but take a variety of courses so you have an idea of what is out there. Don't worry too much about not knowing where your direction is. Most other people don't know either.
I can speak from experience that Law can be dull, but it has its attractions as well (I've got six full years and counting of post-sec, 4 year in undergrad history and 2 in law, with one more to go).
Talk to your peers and to people older than you to get their impressions of various careers (wait, that's what you're doing now, isn't it
). Tell your dad that a pre-condition of you even
considering law is that he has to set you up with at least one lawyer (preferably more) that he knows so you can get an idea of what goes on.