What's a fun thing/challenge to build/do in Minecraft Xbox 360 Edition? (I have XBL Gold)?

What's a fun thing/challenge to build/do in Minecraft Xbox 360 Edition? (I have XBL Gold)?

Fun things to do is to play survival mode with a friend. Not alone because it's boring.

or play creative and have a contest who has the most creative house or sculpture.

it's only fun with a friend

add me if you want to play. GT OGHiigh