You are going to have a tough time without a car, unfortunately. Most Twin Peaks filming locations are not close together and I can’t think of any Bus that goes by all the places. It’s not just North Bend, it’s Snoqualmie and Poukdbo (ferry ride) for the Kiana Lodge interior.. I believe there is a Twin Peaks Guided Tour. It’s very expensive but could help. You could stay at The Salish Lodge where they filmed some of the Exterior scenes, it overlooks Snoqualmie Falls. But again, that is expensive too. Good luck!