this post is to tell myself to stay happy is simple.

Do
smile to yourself
laugh out loud
have a sense of humour (even if it's just yours, really)
count your blessings as they come
feel lucky!
exercise
eat healthy
eat un-healthily, one in a while
make more friends and keep the really old ones
spend within ur means

Don'ts
need to be very rich (nice to have but quite over hyped - up to a certain limit, anymore truly doesn't make one happier)
brood over things
regret things you have or have not done - economics teaches us about Opportunity cost, but the biggest cost is letting opportunity slip
worry