Because barrier islands are thin strips with water on both sides, and Google measures distance in a straight line rather than drive time. A shop in Largo can be four miles from St. Pete Beach on the map but 25 minutes away over a bridge, and Google does not care about the bridge.
That cuts both ways. Fewer businesses hold real addresses on the island, so a legitimate beach address with steady reviews can own the pack there. Without one, target the beach communities with dedicated city pages, salt-air and coastal-corrosion content, and reviews from island jobs, and expect the map pack itself to favor whoever is physically closest.
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