You're on Golf del Sur, which is quite a closed community. There are numerous bars dotted about this large urbanization, but they're mostly featuring live cabaret acts. I suspect, from your ages, you're more interested in clubbing. Forget about Los Abrigos - it's just a sleepy fishing village. On Golf del Sur itself, in the San Blas area, you'll find the club "Taboo's". Rather than offer you directions there in this reply, you'd be best asking at reception where you're staying. It's within walking distance for you. Taboo's features an Italian restaurant, but is also a club, open till 3am.
If you want to splash out a bit, you could all share a taxi fare to get you into Las Americas, specifically Las Veronicas or Starco (on opposite sides of the road from each other), where all the big clubs are.
Hope that helps and that you have a good birthday.