Cups, go to beach, sand section, click the drink machines on the counter. Noon if I remember right. CD, click your boom box in your room at noon or afternoon on the weekend.
I can't remember the exact time of day. It was either noon or afternoon I'm pretty sure. It's the "sand" section of the beach, not the food counter. You'll see 2 lounge chairs, then two drink machines on the counter behind them and 2 girls standing near talking just to the left of the stand when it's the right time.