Depends on what you are sad, upset, unhappy or angry
about?
Personally, I like to sleep when I'm tired at the same time... If
not I just need some 'water' to calm me down... Rain, pool,
fountain... Anything of the same sort can often do the trick.... If
not just find somewhere I like, sit down and think....
Alternatively, you can try chatting with people just to pour out
your woes...? 
