Keeping the Sabbath Holy

So, where do you draw the line?

The Wifey and I minutes ago had a quick discussion about cleaning and keeping the Sabbath Day holy. She mentioned how it was strange that one of the only times she really feels strong motivation to clean the house is on Sunday when it is her personal belief that cleaning and chores like that are breaking the Sabbath. I, on the other hand, am a little more lenient and don't have a problem doing those things. Oddly enough, I don't think its OK to do laundry at a laundromat (or the apartment complex's laundry room ) but am fine doing laundry if you have a washer/dryer in your home. Even more oddly, my wife recently started couponing and having me go out Sunday morning to buy multiple copies of the newspaper for the coupons inside. I don't have a problem using the vending machines to do that (and today I even had to go inside a convenience store to get the last copies she needed. I know, sinner!) :-) So I'm wondering where everyone else draws the line. Is it okay to clean on the Sabbath? Do laundry? What are your thoughts and feelings?