Among the many outdoor water adventures rising in fame, white water kayaking is one bet to make it to the top of the list.  For one, this type of activity is not limited to those with prior experience.  You could go kayaking in the river rapids even without going to a kayak school, although a few lessons in the kayak swimming pool class gives an advantage for the unsure.  There is no question about the amount of adrenaline rush this could give you as you will be facing rapids.  If you are the type who loves to take on an adventure independently then this is all the more reason why this should be your choice.