Do you drive around the country side - better still do you walk?
If you do make a point of asking yourself - "would I land in that field". Ask the question of yourself throughout the year. Chances are lots of those fields will be around your flying cabbage patch. So next time you fly out of your local airport relate what you have seen to what you now see from the aircraft.
You will surprise yourself how quickly your field selection from the air relates to your findings on the ground.
Next, make a point of flying into some of the more challenging strips. Its good fun. More to the point it will improve your landings no end and you will be surprised how much more comfortable you are landing on a slope (and I mean a proper slope), between trees or other challenges that might present - the first few times you will find it really disconcerting, so perhaps take along a seasoned veteran of farm strip flying. I can think of some perfectly delightful farm strips that scare the hell out of even seasoned flyers the first few times - we are really quite cosseted with respect to the usual "airports" most of us operate from. The fact that they are "scary" make it all the more likely the pilot will loose control during the approach. As I think Pace has already said that's what causes severe accidents, but telling pilots not to loose control is all very well, far better to "know" you can land on an up slope between trees and crops because you have done it before.
Finally, as often as you can, when you land decide where you will touch down and make a point of accepting nothing less. Aim to be precise. Don't allow yourself to float that extra 100 feet. As you get better do the same with glide approaches. You will be amazed how many pilots cant land in a 50 foot box with full control of the throttle never mind without. Enter a few competitions - they are great fun and will improve the accuracy of your landings no end.
Should the worst ever happen you will be really surprised what a difference these three suggestions might make.
Your chances of a good forced land will be immeasurably improved by good field selection, accurate control of the approach and potentially just as important, a precise touch down. All of a sudden you can comfortably get into really tight fields feeling confident you will keep control all the way down.
(Of course you could pull the handle and forget all about this
)
(Edited to add: and if you want some real fun book a week (or day) flying a float plane. You will find it is another way of improving your handling and landing selection significantly - but perhaps surprisingly. Why? Well try it in Scotland. You will be flying in very close proximity to the terrain - tight turns into lochs, keeping the aircraft under control, to setup a stable approach, gaining an appreciation of the tell tale signs as to what the wind is doing - there are no wind socks, no helpful controllers to tell you, and surprisingly the wind on one loch can be 180 degrees different from another loch one valley away. Its good fun as well.
In just the same way for something different you will learn so much from flying a glider or with a glider pilot. Doing it every day all day is the way to improve your skills and once learned, whilst its always good to say in practice, it is also a bit like riding a bike)