To all sifus, here is my rough itinerary. Any advice is well appreciated

Thanks!
Day 1
Arrive Kansai Airport --> Aquarium ( buying nankai railway version of kaiyukan ticket at airport )
( Buying Kansai Thru pass for 3 days in airport also? )
Day 2
Osaka castle, Sumiyoshi Taisha
Day 3
Kiyomizudera, Higashiyama district, Kinkakuji
Day 4
Nijo Castle, Ginkakuji
Day 5
Fushimi Inari Taisha, Nara Park, Todaiji Temple
Day 6
USJ
Is there any other places to buy the tickets from besides the entrance?
Day 7
Still thinking where to go ... Any advice? Its around winter season so scenery sightseeing is limited i think?
Day 8 - leave Japan in the morning
Oh and will be going to Dotonbori and Namba at night for few nights for nightlife/dinner I guess.