Hi, I'm going to Beijing in the start of June for a couple of weeks. I'm thinking og taking a trip to a another city for some days (4.June-8-June), and was wondering which cities would be nice to visit. I'm thinking about going to Tokyo or Seoul. Any other suggestions in places nearby thats pretty cheap?

Also, I have to get a visa, and therefore I think I need to send a copy of the planetickets along with the application.