If you are interested in something not crowded and quiet, try Corona Beach or Playa Corona. No cover, pay as you go, cold beer and margaritas, great ceviche, good tacos. Not much of a beach but more of a snorkeling area with half way decent snorkeling. Easy entry and exit to the water. About a $10 cab ride from the Carnival pier. You can see the Carnival pier off in the distance from Corona. My wife and I stopped doing tours several years ago and go here every opportunity. Palapas' , shower to rinse off and massage if you desire.