Too cold in the water

Going on the bridge over the water....

MasterJ: "Look mummy, the water!!"
Me: "Yeah"
MasterJ: "Can we go for a swim in the water mummy?"
Me: "No"
MasterJ: "Why?"
Me: "Because it is too cold to swim in the water"
MasterJ: "Well can we get a boat then?"
Me: "No darling"
MasterJ: "I get a boat like Diego.....Daddys got a boat at home!"