How do I make this game fun?

[Bandobras Took]

on-topic:
you cannot. currently civ:be has little replay value, unless the player consciously chooses to handicap himself.

I've always laughed at that idea. What exactly do you think you're doing by playing on the hardest difficulty level?

 

[Light Cleric]

You should play focusing on Domination. Then you'll always have something to do, and won't be bored hitting next turn for turns on end.

That's sort of what I've decided to do now, start going for domination all the time.

Actually I got bored after my first Apollo few domination games, too. You'll basically have the game won at turn 125-150 or earlier and spend another 50-100 turns tedious moving your carpet of doom around to take capitals with no real threat or contest from the AI.