If you have a phone with GPS (most smart phones do) download something like Sports Tracker. It does use up battery on phone more rapidly than just on stand-by but should last all day, mine will and phone is 18 months old. If phone is Nokia I think it comes pre-loaded. I have an N8 and that did.
sorry i should have said, i have a blackberry with endomondo and a garmin edge 800 for the bike. i want something i can wear on my wrist more so for short walks when i dont want to carry something else, or for walking mountains