I don't occupy the full day for my kids eihter. They have 2 little toy boxes and a few ride on toys and a mini kitchen downstairs. And I just let them do what htey fancy. DD1 who is 3 often asks if she acn do something - e.g. playdough and I let her. But toherwise they always have access to thier books so spend a lot of time reading htem, adn they play together now which helps. but I let them play in thier imagination as much as possible - with dolls, cars, toy kitchen, lego etc. I agree with someone else that it is a good life skill to be able to amuse yourself. Also, ti gives them alot of confidence if they are in control of what they do day to day (as much as possible anyway).
Oh, and I try to involve them in what I am doing as muhc as pos. if cooking, they can mix, or jsut play with pots and spoons etc, or copy me in thier own kitchen. I talk to them constantly about what I am doing. They have their own cleaning trolly adn brush adn mop the floor with me - that adds more work as they always spread the dirt pile around and I need to be really quick at scooping up - but I reckon they are learning good skills that way, adn I am getting my stuff done at the same time.
Now the weather is nicer, my two LOVE being outside, so I let them as much as I can bear (I am alwasy cold so hate it), adn let them run around and go on their bikes and seesaw thingamy etc.
and there is ltos of hte day spent eating or preparing to eat....
Singing songs, story tapes, nursery rhymes tapes, dancing along to music while you tidy, dressing up (I have gathered old clothes and shoes as well as a few commercially dress up things).
Test yourself, dont' out the telly on AT ALL one day and try not to stress. See what DS does.