What's the best enrichment class you've sent your preschooler to and why?

The most beneficial enrichment class that my girl is attending since N1 is phonics class. For young children, they learn phonics through play/in a fun way. My girl can read story books in sentences at very young age, 4 years old. However, for my boy I will not send him to additional phonics enrichment class as I feel his school is providing sufficient lessons in phonics. Thus, the only enrichment class he is attending now is music class. He shows interests in music since young and overall he is very enjoying all the music lessons.