Summer Work In Spain.

Hello,

I am currently a student in college in Ireland. For my college course I have to work during the summer in Spain. I would like some advice on where to go. I am learning Spainish and would like to work in a resturant, cafe or hotel.  I am 22 so although I am hard working would like to be somewhere were there is a good life for  people in there 20s

any help would be apricatated