I've rented scooters on the island, but that was a long time ago. Traffic wasn't as bad, but the roads were just as bad. I remember one that I rented didn't have enough power to make it up a steep hill. Unless you're quite experienced with motorized two-wheelers, I'd recommend against it. I've been a motorcyclist for 40+ years and still ride every chance I get, but have no desire to ride in St. Martin.
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