65 k's all up. the flood relief paddle flatwater with tides and wind most people averaged 5 k/hr. most of these poeple also train
so thats 13 hrs of paddling.
how much training are you doing or are going to do

going to need a lot of water
going to need plenty of food
electro drinks too.
first aid kit,spare clothing, spare paddles etc
a can of drink and a mars bar isn't going to cut it
problems - exposure, dehydration, exhaustion, illness and accidents
any emergencys contact setup for the above problems
any escape routes- any landings in emergencys, anyone on the island to help at those escape routes- do they want to help.
will the authorities be real happy about a call out
whats the tides and current situations around the whole island.
all this is only for starters, so many other factors.
all the elite paddlers- jamie mitchell etc take backup boats on their long paddles
i'm sorry dj, but you would be a fool to do this paddle without a backup boat. you would also be risking anyone elses well being that paddles with you.