This is perhaps the most female-friendly of all man-cave themes, so if your wife objects to a room full of pool tables or Star Trek figurines, try to sell her on the tiki bar concept. Just think -- an island getaway, right in your own basement! You can still have the flat screen, the enormous sectional and the bar; it'll just involve more flowers than your standard man cave. And even if a tiki bar isn't as manly as some other themes, with the right accessories (like vintage surfboards or Hawaiian shirts for every guest) your cave could really wow people. The relaxation factor is pretty high, too -- mix a margarita, throw some Jimmy Buffett on the iPod, jump into your hammock, and you're all set for a day at the basement beach.
Must-have: You can't have a tiki bar without a heavy-duty blender for frozen drinks.