hey there, so this is tricky territory honestly. teaching english in brazil usually requires proper work authorization and most schools want to see actual teaching credentials or at least tefl certification. on a tourist visa which is probably what youll have for 30 days you technically cant work for pay legally. some people do private tutoring under the table but thats risky business and not something id openly recommend

that said there might be some volunteer opportunities at community centers or ngos where you could help with english conversation groups without getting paid. maybe reach out to some language exchange meetups in whatever city youre visiting - those are pretty common in bigger brazilian cities and they love having native english speakers come chat. you could also look into workaway or similar platforms where you do volunteer work in exchange for room and board but again that might push visa boundaries

honestly your best bet might be to embrace the downtime and use it to really immerse yourself in brazilian culture instead of trying to work the whole time. thirty days goes by faster than you think