The "Hill" is just up the street a wee bit from the Law School. LS is on campus itself, but at the southern end. However, there are UG dorms surrounding the LS.
If you're starting in '06, theoretically you'll be in the new building, which should be very nice. It is being built immediately outside the old building... which is going to be taken over by some undergrad department.
To that person coming from Utah... you'll find Boulder is a lot like Provo (and A LOT NOT like Provo), only with the mountains on the other side, and beer flowing in the river (not really, but almost), and prettier.