Yay for getting some time at home with your DD.

In regards to keeping them occupied i find my girls love doing whatever i'm doing, involving them in the housework (ie. helping with dishes etc), baking with them maybe once a week is good if your into cooking.
Lots of drawing, reading books.

Regarding lunch we don't do anything special, maybe find out what she likes most from daycare and have that some days, picnic's at home always work for me too.

I guess in all it's just great to go with the flow and enjoy it.
Have fun.