http://www.fpsbanana.com/maps/35751
http://www.fpsbanana.com/maps/35491
There were a couple others that looked really good, but one would have everyon'e begging for a new computer (more trees than any map I've seen, and you could only see about 50 feet before everything was hidden by trees and bushes.
The other had a slight problem with teh hostages (namely they couldn't follow you out of the room!). THey hosties would close the door that you cannot control, and keep running into every wall in the room!