We are also Malibu fans, but it was a bit hit and miss! Sometimes it was genuine Malibu, sometimes the "equivalent" (nasty). We were there with some member friends who managed to secure a bottle for our exclusive use, but otherwise I would advise actually watching what they pour, as asking for Malibu doesn't guarantee that's what you'll get. The same applied to Absolut vs non-specific vodka, and is why I'd rather walk to the bar to see what is being poured than rely on the (fabulous) pool waitresses.
Also, there is no longer a choice of house wine, Sauvignon Blanc or Chardonnay has now been replaced by a blended grape variety (I think it was Chardonay/Semillion), still drinkable!