Just wondering for fun, since I’m working on my diamonds.
For me, the easiest is probably Halloween for me. Besides that, probably the Nightclub or Bowling.
For me, the hardest is probably fishing or the arcade.
The easiest is always Halloween because I’m officially a Haunted Ghoul. Gwa ha ha!
However, the hardest is the getting the Respected rank from the plaza and getting a 100% completion from the theatre.