http://bahamascruiseexcursions.com/NassauExcursions.htm
This is the site to book the all inclusive one day pass. My boyfriend and I (both in our 30s) booked the all inclusive day pass on June 21 for $100.00 (50.00 ea).
We had a good time but I probably won't book this excursion again because we didn't have enough time. However, I will describe our experience and it may be for you.
We caught a taxi from the boat for $4.00 ea to the hotel at about 11:00a. Checked in to receive our all inclusive wrist band and towels and headed to the dining room. The food was decent. You had the option of selecting from a few items on the buffet line (curry chicken wings, pasta, and chopped beef) and veggies.
After lunch(1:30p), we found two chairs near the pool (great pool by the way...enough space for everyone). Relaxed, got in the pool, and had a few watered down drinks until about 4p.
We decided to head back to the boat to relax and change for dinner at 6pm. There is a taxi line located outside the resort that took us back to the boat for $5 ea. We walked around town for about 30 minutes and headed back to the boat.
As you can see, we paid 50.00ea for lunch and a couple drinks each. So, we probably will try the Atlantis water park next time out. The desk clerk and staff were all very friendly and got us in and out very quickly.