Exchanging US to J

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The closest Cambio would be Banmark, which is further up the cliffs toward the lighthouse. Maybe a 10 minute walk from Samsara, or cab it to the Sunshine Plaza and change your money at the Cambio there or Scotiabank. Do not change it with the touts offering to change it for you on the street.
You can just use your credit card at Samsara until you can get to the Cambio and change your Canadian for Jamaican dollars.
On the other hand, you can go to Scotiabank ATM and withdraw from your own bank account and you will receive Jamaican dollars.