You can give a business justification for many team building activities; whether it’s improving teamwork, promoting leadership or encouraging communication. With quad bikes it’s hard to come up with any serious business outcome to link it to without being spurious.
So, there it is, quad bikes are a fun event and that’s the end of it. The company you work for thinks enough of you to book an activity purely for your enjoyment. You feel valued, rewarded and return to work motivated and more productive.
That’s quite a justification.