Weekends

I am not a person who tours very often. On weekends I go to acting classes and I take the rest of the time to organize my house and put college studies up to date.

Very clean sentence, however it is more usual to make use of on weekends in the US, at the weekends is more common amongst the UK. So it's all a matter of perspective.

And such an expression like "on day", roughly translated to "em dia" in portuguese, could be replaced by up to date.

Keep it up!