When I'm happy i firstly shared the happiness with my loved ones.Then just try to spend my whole day in a very best way like dinner, Picnic, outings etc...
To tell the truth I'm always in good mood and this situation is quite permanent for me. So I'm a happy person and there is no matter what does it happen in my life, because it's wonderful in deed.
When I am in happy mood, I celebrate and spend that time with my family and obviously plan for outing or more energetic fun.