Video: History Summer Camp in China

This 4:49 video is titled, “Dailian History Summer Camp” but I can’t figure out what’s going on.  The music is bubbly but the scenes make no sense:  children playing basketball in kimonos, performances of Korean traditional music, song and dance numbers, jumping rope, and a visit to a historic POW camp (including weapons and torture devices).  I can’t even figure out if the titles are written in Chinese, Japanese, or Korean, but it looks like they’re have a good time (the opening titling is a bit long, so you might want to skip to 0:30).      Can anyone translate this and share what’s going on?  Thank you all.