Sati-Sampajañña (Mindfulness)
This is through maintaining Sati, Samadhi and Sampajanna it self.

1st one should keep your mindfulness in the 4 Frames of Reference. You should have Sampajanna in the following way:


  
  purpose (sātthaka): refraining from activities irrelevant to the path.
  suitability (sappāya): pursuing activities in a dignified and careful manner.
  domain (gocara): maintaining sensory restraint consistent with mindfulness.
  non-delusion (asammoha): seeing the true nature of reality (see three characteristics).
  


Source: Sampajañña also see The Four Sampajanna by VRI, Sampajanna by VRI, Sampajanna-the Constant Thorough Understanding of Impermanence by VRI,
 Sampajañña: The Fullness of Understanding - by S. N. Goenka, The Importance of Vedana and Sampajanna by VRI

Though arise due to sensory input. Perhaps you can try to restrict distraction by non reaction to the sensory input, which is to maintain the domain, and also be non deluded by at least seeing arising and passing nature of the experience. Also if the thought that district you are not related to the path you can abandon them. More on this see Vitakka Saṇṭhāna Sutta. Also be careful there is no lapse of mindfulness which might lead to unwholesome 
 or unsuitable thought to arise.

To quiet your active mind perhaps you can try out developing the Jhana factors. Saṅkhitta Dhamma Sutta. If initial and sustained application is developed within the 4 Frames of Reference this also you are keeping to the domain, purpose, doing what is suitable and non deluded, while also getting and handle on the distracting thoughts through concentration.

To apply this to daily activities always see it your mind is with the 4 Frames of Reference periodically, with initial and sustained application, contemplating the at least impermanence of the of the three characteristics, as you go through your daily activities.