Hi,
My top tip for weekends is: section off the time into three chunks each day - morning, afternoon, evening. That's six in total or seven if you include Friday evening. Each chunk is about three hours with space either side for eating and all the routine stuff like baths and phone calls.
Make sure you and DH have one chunk each totally to yourself - he can go and watch footie at the pub if he wants, you can go swimming alone (or whatever) while the other person minds DC.
Then spend at least one as a family doing nice stuff, preferably outside. Go to the park, to a petting zoo or farm, or to the seaside, cycle in the woods, or walk round a castle etc. Getting outside helps cure that horrible jet lag feeling you get when DC are small and you're exhausted.
If the weather is truly filthy
Spend one together with your DH with or without friends. Get a sitter and go to the cinema, or have close mates over for dinner and wine. Keep it simple. Even if it's just an M&S £10 dinner in and a dvd - it's still time you have agreed you'll enjoy together, which is subtly different from dropping onto the sofa watching rubbish and eating crisps.
One chunk (usually Saturday morning in our house) is the 'get organised' chunk where you get ahead on laundry, everyone mucks in and does chores. As DC grow, this is when they can do their homework/tidy their rooms etc.
That leaves one chunk of time left to do whatever else needs or wants to be done - going round the shops or going to church, having DCs friends over or just vegging on MN etc.
It sounds horribly over-planned, but the reality is, it stops feelings of guilt or resentment over who gets to do what when. It encourages family time together, both mucking in to do chores and also getting out and about to have fun together. I organised our weekends to work like this about two years ago and at first it felt a bit control-freakish but now it's so natural that weekends just work out this way without any negotiation. We know we will all go out as a family, we know Dh will do his own thing at some point, then so will I, and we are all far better at give and take.