At the top of Ms. French’s list of must-visit restaurants was Eventide Oyster Co. in Portland. We grabbed two seats at one end of the concrete bar; an imposing block of granite loaded with oysters on ice occupied the other. The lobster roll, served on steamed bun, diverted us deliciously, but the real star that day were the oysters served on the half shell, accompanied by kimchi, horseradish and Tabasco ices. We tried a half dozen, including the Basket Island and Glidden Point varieties and could have happily whiled away the afternoon at that sunny counter, sipping white wine and slurping up more oysters, but Bar Harbor waited.