The Werewolf's Cave, located beyond the Honey Bee Gate, sits between the Cactus Field and the Pumpkin Patch. The Werewolf's Cave is the home to the werewolf and two spider-like creatures named cave monsters inside of it. There is a gold egg at the end of the cave.
To get the gold egg, gain all the speed you can via boots, guards, oil, Bear Morph, and stacks of Haste and/or Haste+, and then make a run for it, jumping the whole way to avoid getting killed. Extra boosts, however, are not required or needed. If you are lucky, you may be able to get the golden egg through jumping and hoping you do not die. If you encounter the glitch where enemies don't spawn or they are lagging, you can easily stroll into the cave and get the gold egg without preparation. You can get Haste+ by using the Royal Jelly Dispenser in the Star Hall or by using codes.