One of my travel mates called the hotel directly for info about the day pass/rates. Once we tallied $40 x 5 people, my friend went on the internet right from the cruise ship that morning (we were on HAL), and found a rate through Orbitz or Expedia for I want to say $150/160 per night. So, we put 2 adults in the room (there is an extra charge for any adult over 2 and the rest of us stayed in the background, and just charged everything under our friend's name). Then, we went back after showering to check out, and the front desk was very concerned that we hadn't enjoyed our stay and asked if everything was OK. My friend just explained that we planned it that way, that we wanted to use the facilities and have a place to shower before heading back for the evening. And the desk clerk was fine with that -- as long as we weren't checking out because we weren't pleased with the resort.
It really was a nice resort. The pool was huge and had a swim-up bar at one end (but there weren't many people drinking and there was only one bar, and like I said, the pool was huge). There were also several waterfalls that you could swim under. You did need a room key to get your towels, but they would give you as many towels as you wanted. You just had to return them to the stand to not have your room charged. Two of us had no problem getting 5 towels.
Also, we were surprised that the room they gave us was so nice for just a one-night stay through a discount online agency. It had a nice verandah with a view of the pool and the ocean.