Quests, skills, minigames, chatting all those things.
no
That IS the main thing!
Carrals
There are many more than just four things, but a good start would include: be born, grow, reproduce, and die.
well, you could do whatever you want. Many people enjoy diffrent activities. Some people like to just chat with friends, some people like to throw partys and mess around, some like to go to clan...