I can't give you any links but I can suggest:
Ibiza. In case you don't know it's a party island near Valencia where throughout our Summer (May - August) it is packed full of 18-30 year old Brits on holiday for Sun, Sea, Sand, Sex and Sangria. It's home to some of the most famous clubs in the world (including Privelege, the biggest), and has some of the best DJs as residents for the whole summer.
If you go as a club rep, you'll get paid to work for the tourism industry there, which will mean promoting for clubs, giving info to holiday makers, leading tour groups, and a whole load of other stuff. Obviously while there you'll get to party like f*** as well. Spanish is useful but non-essential since most of the people you'd deal with are Brits.
I went there on holiday a couple years back and Thomas Cook were very helpful, so you might want to try them for jobs.[/b]