Coyoacan must see / no evites!

We are heading to Coyoacan on a Saturday, it’s my first time there - we have a timed entrance for the Frida Kahlo museum (I think at 10:30), and will be coming from Roma Norte.

What should we do / not miss? Saw a YouTuber say the mercado is awesome, que mas? We are active, love art and architecture and plazas.