Be in the Now on a Presence Walk
An exercise recommended by Steve Pavilina that he has found helpful to practice living in the present moment is to go for what he calls a "presence walk." Here’s how it works:
"1. Go for a walk alone — anywhere you like, as long as you want.
2. As you walk keep your conscious attention focused fully and completely on the present moment. Do not allow any thoughts of past or future to enter your mind. Do not imagine anything. Do not subvocalize any of your thoughts (i.e. don’t think in words). Focus your complete attention on perceiving the present moment as fully as possible. See what you see. Hear what you hear. Smell what you smell. Feel what you feel.
That’s it. It sounds simple, but it’s very difficult to master..."
Read more in this Pavlina article.