Manana por la manana?

Mañana por la mañana is translated as tomorrow morning.

to a woman: you are beautiful in the morning.

by the morning, at morning or during morning

Tomorrow for(or in) the evening

If you're so inclined, you tell them what you do in the morning, whatever that may be. There's no real "stock" answer to, "Qué haces por la mañana?"