if your going to a resort to act like 18 year old then I think that you will be hard pressed to find a site like this one that is going to be happy about a group of 15 guys acting like 18 year olds. if your plan is to go and act like adults having some fun and drinks and being respectful by that i mean (no puking in the pool, not hitting on every girl, not being ignorant when turned down and so on) than most any adult resort close to the club scene would be fine.. most resorts in cancun are for working people on vacations wanting to relax.. however many batchelor parties have been booked in cancun and usually have a blast. A group that large takes a life of its own so just be respectful of others and your group will be fine..if your not respectful.. the resort no matter where you go can kick your asses out the door.
Cancun is a great choice. But 12 or 15 guys would be hard to cater too. I am sure each guy likes/ interest are different. Overall, are the majority single? Blue Collar? Laid back or high nrg? Music tastes? What are the general ages of the gang? How about the groom, what does he like? (maybe structure the trip to his style) The answers to some of these questions, will help guide the info you want on here from the treaure trove of experience
We were all young guys once trashing cheap hotels. I ran with some wild bunchs. Did some.vrazy sh*!. Just trying to counsel him.
