Make resolutions that are concrete and manageable. “Play with my dog each morning” is more effective than “Get more fun out of life.”

Create an activity for each of your resolutions with the goal "happiness project."  Set a duration for them.  Examples can be found here.

To hold yourself accountable to them, mark when you do each one by clicking "did today."  I recommend you write a blog entry about them as well.  

When an activity is no longer relevant, delete it from your plan.