The farmer lets you use it at Puerto Rico.
you ask the man for permission and then you click on the jeep
you go to the farmers brothers jeep
you have to take your jeep and heard them by the grass
say you need to borrow it.
go riding in the jeep and ride around until you see it
You have to drive the jeep into Wal-Mart and do the hokey pokey.
go to the star in the middle and put three sheep into the patch of darker grass and then get off of the jeep and just follow him
You have to use your jeep and you got to push them in the area with the big rock(s).
well first you have to find three spotted goats then lead them into the Snaggletooth rock with the jeep.
Use your Jeep and scare them into the middle of the big rocks. Don't worry, once they are there, they cannot escape.
You use the jeep to round them up . It's SUPER hard!(in my opinion) I had trouble doing it myself!
it must be a glitch. sign off and then log back on and try again. hope this works ! :]