How to say, "Let's test your sense of direction. How do we get to the car from here?"
“Let's(Google: 让我们) = "让我" but you can use "来"

test = 考, but it is better to use reduplication "考考"

your = 妳的 (it is easy)

sense of direction. = 方向感 (it is a common term )

吧 (optional final particle) 


  [How do we] [get to the car] [from here?]


Google translates "get to the car" as "到达汽车", but the native way is "走到汽车那边"


  [我们如何] [到达汽车] [从这里？] 


English place the location "from here" after the verb clause "get to the car" but Chinese would put the location before it, so the correct order is  


  [我们如何] [从这里] [走到汽车那边?] 


“Let's test your sense of direction. How do we get to the car from here?”

Translation:

"让我考考妳的方向感吧, 我们如何从这里走到汽车那边?"