Oooh, good question, Grizzly, Sir! You've really got my imagination working on this one! I've never actually seen a play room or a dungeon, so I'll have to rely on what I've read about in BDSM and on my imagination. Let's see....
I know that Master would want a variety of whips, floggers, paddles, canes, etc. And add a variety of dildoes, anal plugs, vibrators, nipple clamps, etc., probably all in a toy chest. I would love to have a bondage chair and a table, a spanking horse, a Catherine wheel, a St. Andrew's cross, cages, slings....
I'm sure that I could come up with more goodies....