Calories burned kayaking

Please tell me if I calculated this right it is saying that Kayaking for 1 hour burns 672 calories if this is true I am In HEAVEN!!!!! http://www.nutritiondata.com/calories-burned.html I just dont know if im reading it right!! I'm 62.5 inches and im saying 270lbs with a somewhat active lifestyle please tell me if this is right I would be ecstaic if it is Because the kayaking is so much FUN!!!