At Hollywood's Hard Rock, the pool bar is not poolside — it's pool-middle, at the center of the swimming hole. But there's more here than just chlorine and tap water. There's sand too. Think of it as Hollywood Beach Inland. And no, you don't need to be a registered guest to dip your feet in. If the nearby slot machines don't tempt you out of the water, there's a rock mountain surrounding the lagoon-like pool that's worth scaling to get on the waterslide. Or take a soak in one of several hot tubs. The Hard Rock promotes its plunge as a good place to spot celebrities, but after Anna Nicole Smith's demise, all we saw on a recent visit were celebrity stalkers, including a dubious guy wearing socks under his Birkenstocks. But never mind gawkers like him — it's the cool water that will come in handy when the weather gets hot.