As a heads up for your sailing itinerary, North Sound will be pretty quiet for your dates.

Per your dive inquiry, Sunchaser Scuba (located at BEYC in the North Sound) is indeed absolutely awesome. But they will unfortunately be closed for the season starting August 13th (and have kids camp August 11th and 12th so their real last day is August 10th). Regardless, they will be closed for your trip.

North Sound Restaurant Closure Dates below:

Leverick Upstairs Restaurant - Already closed for the season
Leverick Downstairs Restaurant (Jumbiee's) - Will be open. But I would not expect there to be a Friday night BBQ or moko jumbiee dancers
Saba Rock - Closed August 15th to October 16th
Bitter End Yacht Club - Closed August 13th to October 18th
Nova @ Oil Nut Bay - Closed August 22nd to October 7th
Blunder Bay/North Sound Bistro - Unsure of their plan. Perhaps Tom will respond here.

In summary, your North Sound restaurant options are: Jumbiee's at Leverick, Nova before August 22nd and maybe Blunder Bay