Belize is small enough that you can sleep on a caye and be in a jungle cave the next afternoon, if you respect the weather and the boat schedule. English is the official language. The Barrier Reef, the cayes and the inland Maya sites are the three trip types people actually book. Hurricane season (roughly June to November) and the dry season (December to May) change both reef days and cave access. Most itineraries pick cayes or Cayo as the main block, then add a southern-coast night if time allows.
Northern cayes and the Barrier Reef
Northern Cayes & Belize District is the classic arrival: Belize City airport, then water taxi or flight to Ambergris Caye or Caye Caulker in Belize District. This is scuba diving, snorkelling and sailing country: Hol Chan, Mexico Rocks and Blue Hole day boats when seas allow. Caulker is smaller and slower. Ambergris has more dive-shop density. Wind from the east can cancel the atoll trips even in high season.
Cayo caves and northern rivers
Inland, Cayo & Inland Caves is San Ignacio, the Macal, Actun Tunichil Muknal and Caracol from Cayo. That's caving, river tubing and jungle hiking rather than reef. ATM has strict site rules and a fitness baseline. It isn't a casual cave stroll. Northern Rivers & Maya Sites is quieter: Lamanai by boat from Orange Walk, Chetumal Bay days in Corozal.
Southern coast and Toledo
Southern Coast & Toledo is Hopkins and Placencia in Stann Creek (southern reef, kayaking, and a whale-shark window off Gladden Spit in spring when operators run it), then Punta Gorda and Maya villages in Toledo. The south is wetter and less packaged. Allow slower boats and rain.
Where to base yourself
Caye Caulker or Ambergris for reef. San Ignacio for caves and ruins. Placencia if you want beach plus south-reef boats. Punta Gorda only if Toledo is the point. Combining all four in a week means more transfers than activity.
Booking and getting started on adventuro
Snorkel days, intro dives and many Cayo river trips are beginner-friendly. ATM, Blue Hole and advanced reef sit at improver and advanced with certification or swimming requirements on the listing. Open the Book here tab for live dates. Boat spaces and cave permits are the things that sell out, not the country itself.