Last October, after lunch, we took at cab over to the Wyndam -$5 per head. It is NOT a walkable distance. Myself, DH, DD10, DS5 swam in the beach inlet and played in the sand for about 2 hours. We forgot to bring towels, but did pack bottled water and sand toys.
When the cab pulls up, you just walk through the casino and out the door to reach the beach. When we were ready to leave, there were plenty of cabs at the hotel to take us back to the port.
We plan on doing this again for our 9/12/04 Wonder cruise.
For little kids this is a great excursion, you can come and go on your own time.