((LL)) I do remember when my son was small and it seemed all that I did was child care...argh! Don't know what it is like in your locale, but..here are some ideas for ways to get out with the kids...
Art museums often have child/parent activities..check that out, you could go and enjoy some great art while educating your little ones...and yes, they often have preschool activities..call and ask!
Get involved in a co-op preschool...costs are lowered by you going in and helping out one or two days a week... the ups are that you get adult contact and get to be with your kids, too!
Find a friend who has kids the same age....you take her kids one day a week...she takes your kids one day a week... Both of you watch all the kids together another day out of the week, so you two get time alone and time together...
Get your kids involved in some classes...drop 'em off and take the hour or two for yourself...then pick 'em up, refreshed and happy to see them again!
Church's often have preschool bible classes, get your kids into one of them and take that time for you!
Other museums...science, history, etc. have fun hands-on programs that you can do with your kids...get out and learn something together!
ASK for HELP! Tell a friend or a relative that you really need a day off....say what you'd like most for your birthday, Christmas, anniversary gift is some free babysitting!
And don't make Sundays a day that revolves around him, order in food you like...get some legos/toys/color crayons and books out for the kids and let them play on the floor in front of you while you read a book and he watches football....or while you both watch the game...
And ASK your hubby for what you need...kindly, sweetly, but most definitely...Ask!