This is a very interesting topic for me because I have done a selfretreat during februari and mars and one of my main goals was to establish a method or way to practice during daily life activities.
As I see it the basic approach of being aware of daily activities is the same as in sitting meditation. The goals of the practice is still the same but there are also differences. One difference is that you are more likely to encounter a lot of distractions of many kinds that have the potential of capturing your attention and lead to a mind that wanders and forgets what it was supposed to do. For me it essential to constantly remind me in some way to be aware of what I am doing and that I'm doing what I intended to do. If I can keep that awareness then I know I'm doing well. I remind myself after every sitting meditation that I will try to continue to be mindful.
What's more evident for me in daily life also is the importance of keeping the right attitude towards meditation, being relaxed (if I can), cultivate wholesome states and avoid to dwell in unwholesome states. I have been inspired a lot by Sayadaw Tejaniya. You can check out his techings here:
Sayadaw Tejaniyas teachingsI have also experimented with the usage of mental labels to improve my awareness, for example as the Mahasi method or Shinzen Young teaches. I find that this can be useful sometimes when the mind is especially agitated but for me I find it sometimes creating frustration and tension, maybe confusion when Iäm uncertain what label to choose and so on. It seemed to complicated so therefore I switched to the more simple, relaxed method.
Another way to be aware during daily life is to use the breath which I've also tried. This is a practice that for example Webu Sayadaw was teaching. I found that it worked well sometimes but I tended to forget the breath when I was engaged to more complicated activities.
To summaries I think there are many good ways that you can practice during daily life. I'm not saying that one method is better than the other. I think different methods suits different people and the best is that you experiment and find out what is useful to you, and don't give up if you fail, try to see everything as valuable information, as feedback and adjust your method or technique if necessary. Good luck!