what types of arena's are there?

Discounting all the types of pvp i know there is survival. Any others?

I miss pking in chaos druid robes and bunny ears

Ive played "musical chairs" but cant think of any others.

there's that level 3s race that takes place in a custom map with scattered monsters assuming they still use it.

There's also that rock-race thing where you have to navigate the rocks quickly with good timing (and a little luck) that takes place on a custom map.

probably more I am forgetting.