Paul Walker -- Anchors Aweigh, My Boy ... Dad Sells Leisure Boat

Paul Walker was all about high speed on land, but was all about kicking back when it came to the water ... according to new court docs.

Walker owned a 26-foot Radon boat -- a vessel designed for fishing and diving trips, not racing. He bought it new in 2010 ... just for the halibut.

Paul's father ... who took control of Walker's estate after his death ... filed court docs in Santa Barbara to sell the boat and its trailer to a private buyer for $120K.

Just to compare, a brand new model would cost about $135K -- but Paul Walker never dripped dry on that one.