Spanish immersion learning for kids

Looking for suggestions on teaching my children Spanish fluently, at least good enough to hold a conversation. They’re 4 and 7 yrs old. Not looking for a new school. More like immersion groups for young kids. Or after school/weekend classes, or tutors. Anywhere that they’ll get lots of intentional exposure to the language. I’m open minded to any suggestions, and would love to learn from any non-Spanish speakers who got their kids to learn the language.

Looking for south east Miami, like Pinecrest, Palmetto Bay, cutler bay. Thank you!!