Our 3 older girls are in school during the day while I am home with my 3yo son and 15mo dd. I try to play and read to them as much as I can.
We play with playdough, read stories, color in coloring books, play with our indoor toys, such as the new kid trampoline I bought and our Little Tikes toys we have (cars, rocker, toddler playground with slide, play kitchen). We also play with blocks, pots and pans, trains on their train table, and we do go to the playground, too. We have a wooden playground that we got from a nice neighbor so we'll set that up soon.
I do try to have them play in my direct supervision when and if I have to do a chore and do many of the suggestions by Ms Sandra. I think it's all about balance.