If we wanted the arena to be big, we could have a small desolate town, a marsh/swamp, a rocky cavern and a maybe some sort of grassy field with some trees. So maybe the town could have snowfall, the marsh/swamp could be rainy and muddy, the rocky area could be dry and hot and the meadow could have beasts and bugs? A bit of a mix of challenges? I figure maybe the town in the middle with a cornucopia and the other stuff around it in thirds?

I think if Haymitch got picked, he might have to change strategies, if he knew about the plot, it might tip off Snow when they're watching, he may need to trust Peeta or someone like Finnick or Johanna to handle things? I think a lot of time should be spent in the arena before the breakout happens. Even then, I'm not glued to district 13, we could always have some interception happen where the four (or any others we want) end up someplace else entirely? We'd still need Peeta to get snagged by Snow I think, perhaps Effie and Cinna too?

Just thinking aloud. >_>