Things to see in Seoul

Thanks to a nice coworker that borrowed me the Lonely Planet Korea guide,
I've found what I would like to see while in Seoul.
(we have the weekend of 24-25 September as tourists because we'll meet J
only on Monday 26).

1. Namdaemun-market
2. Lotte-world
3. Coex-mall with its aquarium
4. Cheondogyo-temple
5. Children-grand-park with zoo
6. Gyeongbokgung
7. Seoul-tower
8. Changdeokgung
9. Bongeunsa Buddhist temple

Maybe too many? We'll have a son of almost 5 with us... I've chosen
something historical and something funny for our boy.
But it's difficult to choose when there is so many things to see!