Answer:
"Nous allons"
Step-by-step explanation:
To understand we must breakdown the Je, Tu, Nous, Vous, and Il(s)/Elle(s).
Je means I.
Tu mean you.
Nous means us.
Vous means you (this type of vous is plural but used more so as respectful towards elders or strangers)
Ils is they masculine.
If Je vais au parc means I am going to the parc, we need to add someone with us to make it plural.
Nous allons au parc is the plural form of Je vais au parc.
Nous allons au parc - We are going to the park.
Hope you understand it better with my explanation :)