This walk is a particularly wonderful opportunity for prayer. If the weather is miserable, I can offer that up along with my petition. If the day is splendid, my heart just naturally drinks in God's creation, and the experience elicits an almost spontaneous expression of praise and thanksgiving to go along with my petition.
In any case, the walk to and from the mailbox gives me one more chance to pray without ceasing (I Thessalonians 5:17).
Tip #2 - pray while you pick up the mail