"Wild Man" Off The Market

There is a man at my husbands hotel that is finally getting married. We aren't really sure where he met this woman, but she must be amazing if Doug is willing to settle down. He is a wild man! He's always been so much fun because he's so crazy! He's the type of guy that would have a beer pong table in his living room. We've been invited to the wedding, and my husband even a garnered an invitation to the Bachelor Party (so not sure he's allowed to go!!), but I'm just stumped as to what to get them. Do you go traditional? Do you go wild and crazy? Do you go the easy out with cash?? Honestly, I'm just praying that they register because I'm clueless!