We've hosted two different "guy" baby showers, one for a couple, one where only the dad-to-be attended (she was on bedrest). One was held in a local bar/grill in a private room. Food was very guy-friendly (mini cheeseburgers, chicken wings, etc.) and his favorite beers. The Cubs were on TV and we plugged in the IPod in the background. He couldn't believe how much fun a baby shower could be (we called in a welcome baby party) and actually got into opening the gifts.
The other was held in our backyard, barbecue style. We had two grills with burgers, brats, chicken, had some outdoor yard games, very casual. We had outdoor lights so when it got dark the beer drinking continued with gift opening and the night wrapped up with many games of cards by candlelight! This was the one where the mom-to-be was on bedrest, so it had much more of a party atmosphere.
Regardless, my view is that we are in the 21st century now and just because a man isn't carrying the baby doesn't mean he can't enjoy the celebratory preparations too! My husband who is a "guy's guy" actually enjoyed the gift openings at our couples showers because we registered together - a great idea for expecting parents.