I absolutely love the concept of the Sabbath and dedicating a day of rest from worldly care.
Therefore, generally speaking, I "keep the Sabbath day holy" and try not to do things that require others not do so. However . . .
I also agree totally that "the Sabbath was made for man and not man for the Sabbath" (or whatever the exact quote is), so, for example, I have no problem traveling on Sunday - especially if it's in order to do something that I feel is part of keeping the Sabbath holy - like visiting family and friends, or the homeless, or the widowed, or providing service of some sort, etc.
I also have a diabetic son and a wife who gets ill if she doesn't eat regularly. If my family accompanies me on a visit to one of the units in our stake when I have a speaking assignment, and if that unit is an hour-and-a-half from our home, and if my son starts to feel a low blood sugar level or my wife starts to feel ill and needs food . . . I have no problem "picking ears of corn to eat as we walk through the fields on the Sabbath" - even though we try to plan for those situations and have food with us when we travel.
A somewhat elderly friend who was a High Priests Group Leader mentioned in a lesson once that his wife sometimes gets very tired and has a hard time preparing meals - and that he is a lousy cook, and she hates the food he prepares. Therefore, when she feels this way on Sunday, he will take her to a restaurant after church to show his love and support for her - because she is more important than a general rule, even one as important as the Sabbath.
I really love that principle.