The Seattle Boat Show is a marine extravaganza and the largest boat show on the West Coast. It features more than 1,000 recreational watercraft, seminars and the latest accessories indoors at CenturyLink Field Event Center, plus afloat on South Lake Union.lipper Vacations is offering three customizable Seattle Boat Show packages, all of which include transportation to Seattle, a stay at a downtown Seattle hotel and admission tickets to the Seattle Boat Show.