Easy coins:

     When  Ben  tells  you  to  use  the  metal detector to locate the
Gopher's  coins, go to the barnyard. On the right side of the farmer's
house  you  will  see yellow flowers. Use the metal detector to find a
group of coins. At night, go in and out of the party.
     Each  time you use the metal detector on the side of the farmer's
house you will get more coins.