Here's how cool JOHNNY DEPP is:  Whenever he travels, he brings his Captain Jack Sparrow costume from the "Pirates of the Caribbean" movies with him just in case he wants to visit a children's hospital.

He says, quote, "Sometimes you go to kiddie hospitals and things like that.

"I'll just sneak in and go and surprise a bunch of kiddies through the different wards, it basically turns into a two-, three-hour improvisation and it's really fun.  So I travel with Captain Jack."