RedactedNarrative: Vessel operator had borrowed the vessel from a friend and had a few minutes of time on this vessel in the way of experience.  Vessel operator went out to paddle on the lake without consulting the weather and ended up paddling in strong wind with high speed gusts.  Vessel capsized and Vessel Operator was ejected into   sub 50 degree water and a ways from shore.  Operator now attempted to swim to shore, acquired shore and was assessed for injury by Park Ranger.  Victim was transported to visitor center where EMS services treated him for hypothermia (body temperature 90.5 degrees. )  Estimated time in water was about 1 hour.