Repeat, Bryce 6.1 can export anything, except metaball constructs.

Terrains:

• Select the terrain after you make it how you want it to be.
• File -> Export Object.
  Move the sliders to set the resolution you want (# of polys), and you can export maps; but they aren't so great anyhow.

You can export other things too, as long as there's no metaballs. Metaballs export as spheres and lose all of their meta properties.

Friends don't let friends use booleans.