learn an instrument, start learning a language, take up a hobby, like photography, knitting, drawing etc, start up a new sport, sign up for a yoga class, go for a walk/hike, go window shopping for stupidly expensive stuff you could never in your life afford, write, compose a song (there are tons of software programs you can use for this). There's tons of stuff to do, it's almost impossible to be bored if you're not lazy