I'll do 'the onceover' (see 26 Oct 2010). It gets the basics done, gets me moving, feels good when it's done for the day and doesn't take all that long. A good start.
When my daughter and I worked part time in a very old large garden where the work was never going to be done (in its heyday it had many full time gardneners)we devised an approach that got enough work done and kept us motivated:
Each day we thought of three jobs for the day -
An ongoing one
A 'start and finish' one
And one we really wanted to do.
I could try this at home....