Im a single mum and work 24hrs a week. Have not had a partner living with me properly since dd was born (dp stayed 2 or 3 nights a week, only coming over about 10pm)
TBH I dont see how I would have the time to spend "quality time" with a partner! At the moment, I do housework from the minute dd goes to bed til I go to bed myself! I have one night off a week! (I dont do any tidying during day at all, except one day a week when dd helps me clean-dusting, hoovering, mopping etc)
I am always tired, but try to plan at least one activity a day that burns off energy for dd, but where I can relax (even just a little bit) - the park, walk to shop (5 mins on my own/dd in pram, 30 if she walks too, cause she loves to investigate) or get her to draw with chalk in back yard.
We take at least one "adventure" a week - usually nearby town. Pack a picnic and just go and do whatever we want (park, library, museum, civic center, beach, etc) as long as its cheap or free
If your kids are older give a theme for the next week - for example, we did egyptians last week. I took her to local museum (free) to see the ancient egypt exhibition, to the library (free) to get books, we made a pharaohs mask (which incidently, now i put it on and play a game where I get her to tidy up - cause im the king and she has to do as i say - its great!), and made pyramids and attempted hieroglyphics (shes 2, so wasnt quite accurate )
Week before that we were American Indians and made a teepee and headdresses, printed pictures to colour in off net, looked up stuff in library..
We keep a scrapbook for each week- with pictures she coloured in, I write in titles books we read, and photos of places we went or things we made. The bulkier things are kept in a big plastic bin in a cupboard.
Basically, you can lead it if your kids are younger, but if they are older get them to lead - will take a lot of pride in learning all this new stuff and the role-playing games keep them occupied for hours.
Ooops..that was a long post! hope its helpful tho?!