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A 1:52-scale three-dimensional (3-D) hydraulic model was used to investigate the design of a proposed boat-launching facility at Laupahoehoe Point, Hawaii, with respect to wave action. The model reproduced Laupahoehoe Point, approximately 3,000 ft of the Hawaiian shoreline, and sufficient offshore area in the Pacific Ocean to permit generation of the required test waves. Improvement plans included a rubble-mound breakwater armored with dolosse and stone, a wave absorber, a natural entrance channel, a turning basin, and a boat-launching ramp. A 20-ft-long electrohydraulic wave generator and an automated data acquisition and control system were utilized in model operation. Test results for the 3-D wave action model indicated that for base test conditions, rough and turbulent wave conditions existed in the vicinity of the proposed boat-launching facility not only during periods of severe wave attack but also for conditions when incident waves were 4- to 6-feet. Keywords: Navigation, Hawaii, Laupahoehoe Point, Safety measures, Models, Launches, Protection.