I like underground.
Storm drain tunnel exploring.
Shoot bottle rockets.

Imagine a bunch of fireworks being shot out of a storm gutter and there's no way to get down there that you can see. And the fireworks are being shot out right in front of your house and from down in the tunnel you hear maniacal laughter of the rat-troll-people echoing in the cavern like labyrinth.

Molotov cocktails. Acres of bad graffiti. Mushrooms and marijuana. And one dim flashlight.