I'm running a vacation care program.  We have 10 days of holidays to fill in, and we've been to the movies one day, the fun factory one day, we've got 3 days to spend at parks, we had a "slumber party" where the kids wore their pjs for the day and watched 2 movies while eating pop-corn and chips.  We're going to mini-golf, 10 pin bowling, and the museum.  We're also having an end of holidays party where we have lots of sweet and savoury finger foods and the kids can bring their favourite CD (no course language or adult themes of course) and we dance and eat food and play games like musical chairs.  We're all having a great time and the parks and museum are free activities.  The slumber party was cheap too as the kids provided the DVDs and we just bought some pop-corn and chips. I hope this helps.

Cooking is great fun with a four plus year old....playing dress ups and acting out her fave story bokos...you can make some props and dress ups and put on a show for dad when he gets home from work haha.

Involve her in some house work...fill up a bucket with warm soapy water and get her a car washing sponge and she can mop walls, floor herself etc..(also great fun to try and skate on in bare feet....broken bones and or bruises may occur haha LOL)  she can dust and help sort out her wardrobe  and toys...take her to the charity bins or op shop with her contributions a nice thng to teach her and helpful to boot.

Go to the movies, they always have kids movies on in the holidays...maybe offer to take a little friend as well.  Putting food colour in water with washing liquid you blow bubbles with a straw until they start to pour over the dish and lay a piece of paper over the top and you get great circle bubble patterns..repeat with different colours on the same paper....make birthday cards for those who are coming up...get the video out and make a movie staring her.

have a treasure hunt..have a party for no reason and invite a couple of friends over, have fairy bread and play musical chairs etc.

go into the garden and find worms and snails etc........keep them in an icecream container (until they mysteriously escape after she's gone to bed)

play pretend school and get her to practice some writing and spelling simple words or learn the alphabet etc.

Funny hair day (if she's blond-ish or fair you can dye with food colouring which washes right out)...crimp it or do lots of plats, or stack lots of terry type hair bands on one another on a high pony tail and it looks like an antenae...then both walk around the shops with funny hair and laugh at the people laughing at you (great for self confidence for you too)

tons of things to do that cost little or nothing.  Have a ball these holidays.

make some play dough  have a teddy bear picnic with her or invite mates over,

maybe get some plaster of paris and do hand prints? get a sheet and make a cubby over chairs or clothes airers , bubbles make some with dish washing liquid