how much guests do you have?do you have little of buildings or alot?if you have lots and
they dont go to one,either they dont like the food or the price is high.if you have litlle
of buildings,you need more stands!

Something I've noticed is that the food stands don't seem to be first come first served,
whoever decides to go to the food stand first gets to go first, which means someone across
the park will decide they're hungry, and it'll show their status as waiting in line at
sushi stand 1, and the game thinks they're next in line even though they're no where near
it. Which means no one else can buy sushi until he gets to the stand, buys, and leaves.
Try building more food courts across the zoo so they don't have to travel so far to find
food.

the person above me answered well. I would suggest picking the guest that is waiting up
and bringing them over there to make it go faster, if you can find the guest