Don't be shy I want your ideas!!!

I was just wondering what everyone's perfect PvP area for events would be; i.e. layout/atmosphere/tricks/etc. Mainly just wondering what cool ideas everyone can come up with.

So here's your chance, hit me with whatever ideas you can come up with. Safe or crazy, simple or complex, put it all right here for the server to see.

~Qual~

I thought maby trees with some hidden traps. and only like 20x20 blocks of fighting space. and some mobs roaming around, but no creepers because they will destroy the arena