Favorite Adventure That You Ran. I really enjoyed running the "Chaotic Caves" By JD Neal, for Basic Fantasy role playing system. Its a mashup of "Keep On The Borderlands" and a few other modules. (sans the keep). I did however mash it up with the Morgansfort bf module (which has a keep!). It was a lot of fun, I really dug the area map and all the semi random encounters. The nice thing about the "Chaotic Caves" is that its written fairly open ended. With a little preparation time you can come up with a lot of cool ideas and adventure paths for the hero's.
This is a very standard adventure setting, consisting of a group of monster-infested caves and an abandoned manor-fort, for beginning player characters.