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[Joe]

The fishing tournament takes place mostly at sea, so the islanders are a lot less likely to shoot that down - because it's not on the island.
A bikini contest takes place on the island. For a place where drinking to excess is almost out of hand, it is not a good idea because it fuels the fire. The police presence is small and they'd be vehemently against it.
Also, it runs counter to the veneer the island tourism people have constructed which depicts the island as a quiet, eco-tourism destination. It's really a heavy drinking destination, but that does not look too good in tourism literature.