Any ideas? We are offering 10 volunteers for a day (Johannesburg)

As part of my company's Global Volunteer Month initiative, we (c.10 employees) are looking forward to volunteer for a community cause in the month of June for a day around the Johannesburg area.

May you kindly suggest any ideas you may have for us either for your own organisation that you are part of or any other cause that you have come across.

Many thanks.
Best,
Piyush