Answer:
A large oasis in the desert. Come with cash and leave with none. What am I?
I work when I play and play when I work
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
Although it sounds like I work on a transportation device I actually work in a restaurant.
I am an activity involving pins flying in the air.
It rows quickly with four oars but never comes out from under his own roof. What is it?