I like to do things now but have learned the hard way that jumping on every good idea leads to overwhelming and burnout.
That's why I love the idea of a 'One Day List'—a running list of all good ideas (at home and work) that you would like to do one day. Just because you are saying, 'no' to something now doesn't mean 'no' forever. Once you are finished with your current projects, you can turn to that list versus just reacting to whatever comes your way.
For all you product/eng folks out there, think of it as the backlog for your life and job.
What's on yours?