Hi @Former-Member how are you? It's been great having you on the forum, just wanting to take this moment to say thanks for your input over the year. Much appreciated.
In regards to volunteering ... the experience for my clients is either they go online (seek.com/volunteering) and apply broadly to agencies, or they go to their local community centre or somewhere they live close to and apply to volunteer. The fact that it's close to home is important as transport is often an issue. Or they ask people who they know are volunteers for referrals.
Other ways are to hit Google ... find places that want people over the holidays, that cater to not only your skillset but also your passion.
What are your passions? What would you NOT like to do (recently met someone who will not work with and therefore volunteer for the elderly! and fair enough everyone is different!).
Once you have decided on one or two areas to volunteer in, then approach organisations with your resume (include an objective stating why it's important to you).
Another way is to go to Volunteering expos, without knowing where you are I can't make suggestions, but one of my clients began volunteering for a Green cause through meeting someone at an expo and is now working in the field.
Just remember that as with other jobs, the organisation will want to make sure you are right for the job too so a good resume/cover letter/short one minute speech will be needed.
Also visit your TAFE's Careers department they should also have Volunteer jobs bulletins.
I hope I've suggested something you hadn't thought of already! I'll keep thinking ... 