Depending on whether going for a shot, going for a walk/hike or going from A to B.
If the first, don't use books (never look at) or photos (as I don't want to be swayed), so try and go to places that are not really visited. Rarely works, so end up taking the shot you've seen a thousand times before!
Walk/hike I almost always go off a circular walk (so have a good set of books/guides) and use combo of the guide, OS map and GPSr
Downside to the A to B is that you're usually not at the right time of day, weather and can't see/think of a good location! I frequently drive South Wales/Peak District and have "cut the corner" to take in the Malvern Hills as things were looking good. By the time I get there the sun's gone, it's freezing cold and for some strange reason I've lost all incentive to take a shot!
See the bottom of
Derbyshire Views as I've done a description of how I ended up with those first 2 pics