You can join the Suzhou Volunteer Organization through the Suzhou Volunteer Network, of which I am a member. If you go alone, it's more difficult to get in touch with the home. There are other volunteer organizations that go to homes for the elderly, play games with deaf children, pick up garbage in the mountains, and guide people in subway stations. You can join whichever group you are interested in. You will get a volunteer card after joining.
When you go to a home for the elderly, you'll usually be chatting with them and giving them massages.