On Passagemaking under Power, Dave Swan, who owns a Rough Water 57 describes taking his boat (and hundreds more also went to sea) from the Ala Wai in Honolulu Hawaii. The problem going out were the slower boats--some were only able to make 2 knots, and avoid running over them. Coming back in, it was navigation thru the reef, because even 10 hours after the Tsunami hit, there was still a lot of surge in the pass. Once in the harbor, it was very difficult to get the boats into the slips--again there was still significant surge, which would push the boat 2 to 3 slilps sideways as they tried to line up.
The boats which stayed in that or other nearby harbors sustained significant damage.