It is always good to review your current training program and note your successes and areas that you feel need improvement. Many times we have a tendency to stay in our own comfort zones by walking the same route or distance and sticking to the same workout schedule. Staying in that zone is easier than breaking the routine and challenging ourselves to achieve new goals.
If you are walking the same way all the time, your body gets used to your training, and you will not get as much benefit as you would if you varied your program. Also, by repeating the same motion over and over, you run the risk of injuries from overuse. Now is a great time to break out of your comfort zone!
Add variety to your training program to strengthen and challenge your body and your mind. Cross training will work your body in different ways so you can achieve better balance. You can cross train in several ways. Find another sport that you enjoy like biking, swimming or cross-country skiing. The muscles used for walking will have a chance to recover while you strengthen opposing muscles.
Another idea is to take a different kind of walk such as hiking or walking up hills. Try taking shorter walks, but at a faster pace than you usually walk. Try interval training where you walk at a very fast pace, slow down, and then speed up again.