Be forewarned that many have found the outlet mall at Tulalip disappointing in the way of bargains (though this may change with the retail crash). There's a Hilton Garden Inn next to the Boeing factory tour start point (rates starting from $89.10 for your stay night). Maybe better to stay there the Saturday night, go for a morning tour and then go shopping the rest of the day (allow yourself 45 mins to cross the border).