Once you reach level 17 a new reward option opens up, the "County Fair." Each week you race to get the most County Points against 9 other players. The winner each week gets a farmhand and four chests, second gets 3 chests, third gets 2 chests, 4th through 10th get 1 chest, and 1st through 3rd also move up a level. Crafting recipes grants you wagon points (insert list of items and point values). Once the 7 days are up, you can claim the prizes you have earned.
This was recently changed to Winner's Wagon and it is much differently organized. Much more info is to come soon!