The trio are set to cycle 30 miles a day over a 10 day period across Zanzibar and together hope to raise a whopping £100,000.
Their sponsorship will be donated to the charity HIPz - Health Improvement Project Zanzibar - to help improve the lives of local sick people.
The father of Peter's girlfriend, Emily MacDonagh, set up the organisation and Peter, who is a patron, visited Zanzibar in February last year to see the good work they have already done.
Yesterday (6 June), Peter's brother Michael shared a picture of the trio as they embarked on their journey, adding: "Zanzibar - here we come!"
It's clear Peter is in good spirits despite the gruelling challenge ahead, as he has since tweeted: "Just got a car in Zanzibar and didn't have to pay.... It's afreeca." Boom boom!
Fans can sponsor Peter, Michael and Carl via their Just Giving page.
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