sorry fpr all lowercase letters, typing and holding the babe ;)
personally, i think the key to enjoying life...being happy, is simply to find joy in the little things and that may mean, at the grocery store ;) i am a mother to my 10 month old son, who was born 3 months early, i lived at the icu for 70 days, so that helps keep things in perspective. i work 4 days a week( my son comes with me), have two tween step-children and do all of the housework, cleaning, shopping, cooking etc because my hubby travels a lot and works 12 hour days, and yet honestly i am pretty joyful.
exercise daily ( for me this us walking or running with my son) thus keeps me happy and upbeat
have an organized house and minimal "stuff" (it is so much easier to keep clean)
enjoy family meals and cook if you like too, but dont if you dont ( sounds simple, but if you hate doing something see if you can eliminate or reduce it, this is how i feel about laundry so my solution is only doing it one day a week, what gets clean is what gets clean, and then i dont worry about it for the rest of the week )
once a day do something fun instead of a chore, like leave the dishes in the sink and instead lie on the floor with your kids and be silly, etc. when you go back to the chore you will approach it with way more joy
have sex with your partner, seriously, everyone in your whole house will be happier, lighter, and more joyful :)