What is the specific itinerary from Seattle, USA to Vancouver, Canada?

You can pass through the beautiful Mount Rainier National Park. To go to Canada with a US visa, you must first apply for a visa. I need to remind you that the Canadian Embassy in San Francisco does not accept visa applications, but the one in Los Angeles does. You can submit your application by email. You can check the specific documents from the Canadian Embassy website. One last reminder: if you rent a car to go to Canada, most car rental companies will charge a drop off fee. Each company is different, so you have to ask. Another thing to ask is whether the car rental company allows you to drive across the border. Border to Canada or Mexico. Some companies have their own GPS systems that can track the whereabouts of cars, so they know if they cross the border.