I've walked with a lot of people and we seem to watch our feet more than the area that surrounds us, more so if using trekking poles. Looking around and listen is something that you have to work at, and really important if you like bushwhacking. Look behind you a lot, get a mental picture of landmarks. What side was the water on, clearings in the trees, rock formations etc. In the Rocky's a sunny day fades away around 2:00 in the summer and the clouds make the surroundings look quite different. My gps (etex) shows a route trail as I walk so back tracking is simple. Always have a topo of the area, your gps may not get a fix on you at all times and leave stumped. Leaving a "tp" trail may not be to reliable with guys like me who pick up trash as I walk. LOL Look up foot Orienteering, it used to be a popular sport, you may be able to get some help on using a map and compass.
P.S. don't carry your car keys with you on your hike you will never find them in the dark.. Cheers