Dirt Bike Birthday Theme Dirt Bike Birthday Party?

Dirt bike birthday party? - dirt bike birthday theme

my son is a year in May
I have a birthday party for him big.
His father is a great guy dirt bike ...
and I am sure he will love him.
So I want a Dirt Bike Theme Party.
I can not find good facilities. and the good news.
Ideas?
or anything else that could be good!
thank you now!