Well the usual 'lads holiday' destinations are Kos, Malia, Faliraki, Kavos, Zante, Ayia napa, Shagaluf and ibiza if youre staying in the med.
I went to kavos last year, and it was wicked, so many bars and so much alcohol.
I went to zante the year before and that was wicked too, although everywhere tends to shut up at 4, only leaving 2 places open which get packed out. I think one was called Cherry Bay, the other was out of the way a bit and sucked.
Im not sure on where to go this year though ive been told malia and kos, but ayia napa sounds good to me.
Most places are good if YOU make them good.