Resume: Quality and Quantity

When constructing your resume, how much should you include in it? I know it's restricted to two pages (for most law schools, there are exceptions) and that it's best to try to be comprehensive. However, I have had several jobs and positions/, and I am struggling to include them all in 2 pages. I have cut my part-time jobs, but am still missing internships and extracurriculars that were really important/valuable to me, and I want to include them in my resume and application.