Whilst I hate the West End and think it couldn't be less "Ibiza", I am asure I would have loved it when I was 21.
For your mate that likes black women, please try to ensure if a black woman approaches him in the West End (or anywhere in San An) and holds her hand out, that he does not take her hand or engage in conversation in any way. I won't go into the details of what might happen to him, just trust me on this.
At your age, you will probably enjoy plastic bar after 10pm. Very busy ful of teens - early twenties, 99% of them are totally mullered on alcohol or something else. It's not in the west end but near the egg, roughly opposite the rear of Itacas.
On the very rare occasions I am forced to go to the West End, I don't mind Hush bar. good music, extremely well air conditioned, reasonable drinks prices, but doesn't really get going till very late.
Do recommend that before heading out to the West End you try out one or two of the bars along the front, Itacas in particular is good and plays good music and no twats (ok, not too many twats). You could alwatys pop to Linejker's a couple of doors up as well.