First climb the giant tree. Then go see the mayor and he will ask you to get 15 wood. (Should be fast if you climbed the giant tree.) All you have to do is cut 5 trees and return he will then give you the mega potato. Return to your farm and switch to mega potato and then plant the crops.
Its as cheap as the cabbage But gives alot more money.
Getting the Riddling Skull:
Finish Yorick's Resting Place and WAHLAA!
Finish Yorick's Resting Place to unlock it.
Sometimes you can fly things other then planes:
1.Insert a skateboard insert a plane tool ride the skateboard use plane tool then fly it like an original plane.
2.Insert a mini tank from the insert then use the mini tank tool then drive it out of the base you will float.