Just in case you fall out of a plane without your 'chute

As another poster said, falling like you're hugging the top of a giant ball can reduce your terminal velocity by an extra 5MPH, but it's unstable. However with your pants acting like a drogue, you might be able to stay stable enough to use it's effect.

I'd agree with you however, gaining lateral velocity instead of vertical is perhaps key because 'tuck and roll' could probably save your life. It's also worth remembering that the human body can survive more g-force through their back than their front, so the 'tuck and roll' landing increases your odds. Although carrying a backpack full of foam would be preferable if you wanted to try the 'tuck and roll' landing.

One of those pools of colored balls at a McDonald's Kids Playland?

I've also read that you should come down in a sitting position on top of a tree. Haystacks seem like they would be too hard to spot until it's too late. A grain silo might be recognizable and have a thin enough roof to be helpful.

I suppose you could aim for the suburbs and hope someone has one of those obnoxiously large trampolines.

    Glass hurts, but it gives. So does grass. Haystacks and
    bushes have cushioned surprised-to-be-alive free-fallers.
     Trees aren’t bad, though they tend to skewer. Snow? 
    Absolutely. Swamps? With their mucky, plant-covered 
    surface, even more awesome. Hamilton documents one case of 
    a sky diver who, upon total parachute failure, was saved 
    by bouncing off high-tension wires. Contrary to popular 
    belief, water is an awful choice. Like concrete, liquid 
    doesn’t compress. Hitting the ocean is essentially the 
    same as colliding with a sidewalk, Hamilton explains, 
    except that pavement (perhaps unfortunately) won’t “open 
    up and swallow your shattered body.”