The beach may stretch for miles but it's not the same all the way. It's divided into multiple parts as depicted on the map. As of now, Ken is standing on the regular body swap beach. It's by far the largest section filled with most people.
Adjacent to body swap beach is the Naked Bay, a place akin to a nude beach. Patrons that want to enter this section are required to undress their clothing and remain naked their entire stay. It's enticing to reach the place if only Ken has a better body to put on display. Nonetheless, he could still go there and sightsee the bodies people want to brag about.
Then next to Naked Bay is Permanence Cove. It's accessed by passing through Naked Bay or going back to Midrib avenue and skipping Naked Bay. The waters in Permanence Cove are different than that of Body Swap Beach or Naked Bay. Here, only consensual swaps can happen. Meaning, people can only swap bodies if both parties agree to the swap. The swap is somewhat permanent. While it lacks the time limit of Body Swap Beach, it can still be reversed by dipping in the water with a consenting party.
There are more areas left to explore but his childish ecstasy is keeping Ken from reading the rest of the map.