Two of my dearest friends actually told me they didn’t think they had useful advice for being happy. However, their answers gave me Tip #23.
If you don’t feel happy at the moment, just remember, “This too shall pass.” Or, as Faye, a long-ago work buddy once told me, “All sunshine makes a desert.” You can’t really appreciate being happy, if you don’t know what sad feels like. So the next time you go through an “unhappy” phase (and we all have them, even me) just remember it won’t last forever and move on.