I suggest hides have a hide and possibly a fake plant or two -- it makes the viv more interesting for the snake.
As for what type of hide, I say get an exo-terra one. They're awesome! They last forever so you never need to replace them. Here's a pic. of my corn on one of them:
But be careful of where you buy it, as different pet stores' prices can very drastically. At my local pet store, the largest one was about $22, so I waited until a reptile show (<---- the best place to get it), and they were selling it for only $14! BUT they were having a 50% off sale, so it was ONLY $7!!!