Each month I do a day long solo retreat. I stay at home, practice a series of different meditations, interspersed with reading something on Buddhism and doing some creative activity. About midway I be sure to take a break and eat something. This gives me a sense of being immersed in my practice and I find it rewarding.
I do the same thing from time to time, and it is quite helpful.
As someone had said, a good place to start is by setting your motivation. This part should be easy, because with a good motivation it will be a success. I would also suggest having a rough outline or idea of how you wish to divide up the time, but it is good to be a little spontaneous too.
I think home (if possible) is the best place to do something like this. I think one aspect of retreat is to try to create a boundary in which to practice. On a few levels actually; a physical boundary so that we may practice undisturbed in a more concentrated manner, and also the aspect of taking retreat from our normal mundane living and habits (if that makes sense)...
Here are a few ideas for your own personalized one day retreat if you decide to go this route:
Don't turn on the television or computer, let others know ahead of time you will be "busy" that day so you may not be interrupted. Try to go the whole day with no phone, no music, and so-forth. Focus on whichever practices you are doing, and break the day up according to your practice. Not sure what kinds of practices or meditation you do, but you could spend time on different aspects of practice so that you do not fizzle out from constant focus on meditation (eg. prostrations, confession, prayers, etc.). You could also take some time in between formal practice to read dharma texts (I had recited the bodhicaryavatara for example), take time to eat wholesome food, maybe even a short break to have a walk, etc. Point is, make this day about being aware no matter what it is you are doing at the time.
I think these kinds of one day retreats are a great practice. It helps us to be a little disciplined when we devote our whole day to dharma practice, and it is a helpful way to re-energize our practice too.
Just a few suggestions for a single day solo retreat at home. I think you will see the benefits of doing this from time to time whenever possible!
Hope this gives you a few ideas.