I've been on several cruises and I think they are all pretty laid back for a bachelor party. I would at least suggest a specialty cruise with bands or specific a specific type of music that you enjoy. I recently took a "groove cruise" which is probably on the extreme side of the party cruises and had a blast (it's all techno though). The company that offers these is whey travel and each cruise line has their own version (although I doubt the groove cruise could be beat). Good luck!