My statement for each application was different. For some I talked about a single life event, and how it related to wanting to study law. Then I would tie that in with my academic and extracurricular activities.
For other applications I discussed multiple events that have contributed to personal and academic success, etc.
If you want some specifics feel free to PM me. Basically, your PS will change depending on the school. You are given different character limits and different topics to explore, and your statement has to reflect the values held by individual schools.
I'm also happy to discuss my ECs and volunteer experiences through PM.
I've gotten into Lakehead so far, which is largely holistic, so I guess my PS and ECs must have made at least some type of impact, because my academics are slightly below competitive.
Where are you applying? Softs matter moderately for some schools and not at all for others.
The University of Toronto has published examples of personal statements submitted by students who were successful in the application process: https://www.law.utoronto.ca/documents/JD/UofT_Law_Personal_Statements_Examples.pdf
IMO they are rather unimpressive, and it is the most competitive law school in the country from an admissions perspective, so I wouldn't sweat the personal statement too much. As for CV, there are loads of K-JD students who have never worked a day in their lives before law school and yet get in.
Nobody can really tell you what a "good" volunteer experience would be, and I'd be more focused on volunteering in a capacity that interests you and that you actually care about, so that you can do a good job, leave a good impression, and be able to speak to worthwhile things you personally did there.