Question

At the fair not only can I eat tasty food but I can also see awesome fireworks

Answer 1

What Exactly is your question? This sentence could be written more fluidly. 
"When at the fair, not only can I eat tasty food, but I can also view awesome fireworks."

Or I would completely reorganize it like this. 

"At the fair, I can eat really tasty food, and see cool fireworks displays."