Just did Atlantis via Comfort Suites and booked the hotel with points through choicehotels.com for our August cruise. I bought most of the points I needed. I needed 3 rooms for 12 people going to Atlantis and so I only needed 30,000 points (only 10,000/night per oom).. There had been some postings about Comfort suites not guarenteeing access to Atlantis on the day of arrival so obviously not good for trying to get into Atlantis from a cruise ship. I had called at one point and was given the same message. I booked anyways and called from th ship the day before and said there would be no problem. The process took a while to get the 12 vouchers which then have to be presented at the Royal Tower desk for entry. There are a number of fees and I was charged $191/room at Comfort Suites, but still less than $60pp even adding in the cost of the points.
We had a good time for the most part, but lost time on the slides because they close them if lightning is in the area. What suprised me at Atlantis was that food and drink prices were fairly reasonable.