I want to go to a seaside in Shandong for a three-day holiday in go on road trip. Where should I start from Cangzhou?

Qingdao, have fun. The seaside in Qingdao is quite good. You can visit four cities in three days. Think about what you can do. Grab a place to play seriously. I'm going to Qingdao this Friday and tomorrow, also by car, to remind you to contact a good place to live before going. It's the peak season, and a room is hard to find. Of course, high-end hotels are better.