Yes, travel insurance is genuinely important for a trip to San Pedro on Ambergris Caye, and the honest case rests on three real factors: serious diving on Belize's barrier reef, a real Caribbean hurricane season, and a multi-step evacuation chain if something goes wrong on an island this far from a major hospital. Even visitors sticking to the beach and the golf-cart streets of San Pedro town benefit from ordinary medical and trip-delay cover, given how weather and short inter-island flights can disrupt a Belize itinerary.
Diving is the main draw here, including day trips out to the Great Blue Hole, one of the most famous dive sites in the world, and deep or technical dives carry real risk that a generic travel policy sometimes underinsures. Confirm your policy names scuba diving specifically and check any depth cap before booking a Blue Hole excursion or any reef dive beyond snorkel depth, and keep your certification card on hand since some policies ask for it as part of a claim.
San Pedro has a small local clinic for routine care, but anything serious is typically stabilized there and then transferred first to Belize City on the mainland, with the most serious cases referred onward internationally to Miami or, in some cases, Houston. Confirm your policy covers medical evacuation and international repatriation rather than assuming island or mainland Belizean care is the end of the story.
Hurricane season across the Caribbean and western Atlantic runs roughly June through November, and storms can disrupt flights and boat transfers to and from the island with little notice; trip-delay and cancellation cover is worth checking closely if your visit falls in this window. Keep any clinic paperwork, dive-operator incident reports, and receipts for treatment or cancelled excursions, and check the claims-reporting timeline in your policy wording before you travel.