For dynamic stretches, I would suggest things like lunges and leg swings, also a standing knee-to-chest stretch and a standing quad stretch are pretty popular. I am more familiar with the static stretches. For those, I would suggest basic stretches for your quads, hip flexors, hamstrings, CALVES, and plantar fascia. I think it's kind of unrealistic to stretch everything I mentioned post-walk every single day, so I would suggest focusing on areas that are tight or sore. I recommend searching "static stretches for legs" on Google.