Personally, my easiest tour is Elite Scavenger Tour. The time constraint gives a big enough error margin (you have to clear it with more than 2 minutes left, and you get 5 minutes to complete it), it can be done very quickly and you get a lot more medals. With a proper strategy, everyone can grab their required furnitures quite easily, but it's a better idea to do that by yourself anyway.
My most frustrating tour is the maze one. Alone, it can be easy if you don't get lost and don't forget what fruits you need to bring. When you play with other players, it becomes insanely difficult and unfair because actual teamwork is required! If one of your teammates fails to bring the fruits you need, you're almost assuredly going to waste too much time on finding the remaining fruits. Fruits are even evil, as some of them can be hidden too close to the bushes. To this date, I've yet to see a team who manages to get a gold on that 3-Stars.
My most frustrating tour is the maze one. Alone, it can be easy if you don't get lost and don't forget what fruits you need to bring. When you play with other players, it becomes insanely difficult and unfair because actual teamwork is required! If one of your teammates fails to bring the fruits you need, you're almost assuredly going to waste too much time on finding the remaining fruits. Fruits are even evil, as some of them can be hidden too close to the bushes. To this date, I've yet to see a team who manages to get a gold on that 3-Stars.