Can't help you with China.

In Amsterdam: get a bus to one of the parks just outside the city and take mushrooms(bring beer they taste horrible).

Take the "free tour" - you pay what you think the tour was worth so the guides make a real effort - perfect to orientate yourself.

Try as many variates of weed as pos.

Go to the red light district and wonder why anyone would pay for sex with a large black woman in a window.