Did the Corregidor day tour a few weeks ago... thoroughly enjoyed it.

Some of the stuff they have set up is a bit kitschy.. and the guides are a little silly at times... but they do have a decent grasp of the events of WWII. Much of the place "speaks for itself" anyway.

Might be worth the overnight stay... didn't do that so can't really comment.

The whole thing was better organised from start to finish than anything else we did in Manila...