A 2 days Itinerary...

Day 1
Morning: Visit the Hozenji Temple
Lunch:  Kansai style sukiyaki at a restaurant called Kitamura
Afternoon: Visit the Shitennoji temple and then have a craft beer at the Osaka Shochikuza Theatre
Dinner: Hanadako Resturant 
Evening: Night shopping at the Namba District 
Day 2
Morning: Visit the Minoo National Park
Lunch:  Jibundoki Resturant 
Afternoon: Visit the Osaka Castle and afterwards visit the Osaka Aquarium
Dinner: Abeno Takoyaki Yamachan
Evening: Watch the sunset from the Osaka Station