Need to see what boats are available to use. No idea what to paddle for it . .
You can't go wrong with a GP boat, there's plenty in the boathouse, alternatively, you could do it in a Canadian, get one or two more people to do it with you. If you feel comfortable in a wavehopper, get onto the marathon committee, they'll lend you a Fastwave (Exo version of the Perception Wavehopper) if they have any spare.