Walking is good, and in general any exercise you can withstand is good. It should be suited to what works best for you. No two people are going to be the same. You know what your limits are, and if you don't know what the exact limit is you know the general area. Stay within your limits but also set a little further distance each time out. Eventually you will find what works best for you and by no means overdo it! Take your time getting there and back. Losing the weight, if only a little bit at a time is recommended and after healing you will want to strengthen your core. Best of luck and glad to hear it was successful!