I'm having the opposite problem: not enough fun.
I wanted to build a 11x11x11 fort (plus a little bit more), churn out a lot of wealth, pack it full, then have Fun. Alas, I've only had one pitiful siege, the minotaur died when I blinked, and the forgotten beast had already left by the time I got around to actually connecting to the caverns.
While I'm waiting for something to come and overrun me, I decided to dig down to Z level 0. Maybe I'd pierce the third cavern, and have Fun that way.
But no, I hit warm stone at Z level 84. There's (I assume) actually magma pool higher than half way to the surface. Darn it I wanted this fort to die, not give me a relatively shallow magma pool that makes me want to keep it going.
Just watch, as soon as I decide I want the fort to survive, *then* Fun will come.