I'd say Chinatown too. After your meal, some things to do with a 9 yr old boy when you are walking around:
point out the bbq ducks hanging
go into a candy store for some interesting finds
have a sesame bun at a bakery (YUMMMMM!)
Bubble tea!!!
Go into one of the "general" type stores for those "popper" things. The things that pop when you throw them at the ground
Find a store with swords
get him a fancy pair of chopsticks to take home.
See if he'll try an aloe vera drink from a store's cooler.
We cannot be friends if you do not know the difference between Mayo and Miracle Whip.