Teen volunteer opportunities in north Miami Beach

Looking for ways to keep my 17 year old busy while he visits this summer. We are new to the area so we don’t have many connections yet. He won’t have a car but he does have a bike, so he will be sticking close to the north Miami Beach area (We are a couple blocks south of Surfside). Volunteer opportunities that involve animals, progressive politics, or are LGBTQ supportive would be ideal. Suggestions?