There is really a cool tool available in Spark. Did you know that you can mark on a google earth map the route you want to walk and it will calculate your distance and calories burned? I did this yesterday and it also allowed me to calculate my route if I either walked or rode a bike. You can also save your route so you can always can go back to it.
You can find this tool under the Healthy Lifestyle tag, then click on fitness and then scroll down to fitness maps.
I think next to the nutrition tracker this is the most incredible tool. It gives you such a good visual of where you have walked and you can even add it to your fitness tracker. Whoever developed this is a genius. I'm sure you will find this a very useful tool if you are into walking outdoors. Have some fun with it.