is the most famous beachfront resort near the Nassau island
, Bahamas. In reality it's more like a luxury water park with everything one can imagine. There are Mayan pyramid, own Taj Mahal, swimming pools wuth huge fishes, water attractions, children playgrounds and many beaches - both oceanfront and in the inner lagoon. It is definetely worth to visit. Shore and seabed: sand. 
Hotels  Atlantis Paradise Island
is an upscale resort with rooms' fares from $500 to $25,000 per night. If it is too expensive for you, it is possible to pay $50 per person to spend a day in the hotel's area.
The property is overpriced and overcrowded by daily guests from cruise liners. The service and food are not so good, as you could expect from luxury property. In fact you just pay for a huge territory with great amenities. Find hotels in Atlantis
How to get there 
Fly to Nassau international airport (NAS)
or get by cruise ship from West Palm Beach
. Next take a taxi.
There are many cheap flights to Nassau from USA and from Canada, uncluding low cost airniles. So it makes no sense to take ferry from Fort Lauderdale to Bahamas. Find flights to Atlantis
When to go 
The best time for a beach holiday in Paradise Island is a dry season in the winter half of the year. As for the summer time, sea water is much warmer, it's no so crowdy and all kinds of costs are cheaper.
Water temperature, C
Wind speed, meter/sec