San Pedro is "La Isla Bonita" that Madonna made famous. Now it's a tourist mecca, but still boasts great beaches and plenty of dive shops so you can enjoy the sun, sand, and sea. Plan a side trip to Caye Caulker while you're here; it is less developed and more laid back, and has its own splendid swimming areas.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.