Zante's Laganas area is perfect for that "lads holiday"... I know as me and the chaps did it a few years back (nearly 5 now

)- it was very hot, about 15 minute walk to the beach past as many bars as you could see.
Clubs were free and plentiful, locals were non-existant (or well hidden), food was cheap, booze was cheaper- majority of places giving out 2/3 free shots with every pint bought which was around £1.50.
Most clubs open until 5am, "black & White" was open until 8am on foam party night (although if you hadn't left with someone by then you would be far too drunk on the cheapy drinkies to realise the time.)
When we went we were spoiled by sharing our hotel with a girls netball team holiday which was superb!!!
We went in the July and were caught in the sun everyday of our 11nights - very intense heat but 'dry' rather than 'muggy' if you can relate to that
If you are looking for more of a cultural and quiet holiday I would recommend the Tsivili area: it is much quieter and has no 'yob-attachment'

There are several great excursions to be taken from this area also- "quest to shipwreck cove" (or whatever cheesy title it holds) is suprisingly worthwhile, beautiful little hidden gem of greek beach scenary. The Blue Caves are also beautiful. There is also a high chance of seeing Turtles during the summer
I wouldn't go back to be honest as I feel as a (relatively) small island it has nothing new to offer me now. This atop suspicions that the 'lads-holiday' area will have increased in both size and rowdiness, and I'm quite frankly past that stage of holiday desire
Shipwreck Treasure Adventure Secret Hidden Smuggling Rape Island Cove Bay Quest:
The Blue Caves: