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The answer to this question can only be said with opinion, but I can tell you that the Landyachtz Evo has won more consecutive downhill racing championships than any other longboard in the world. It's a drop-through board with a drop down design. It was designed by DH riders specifically for going downhill. This would be your best bet, if you'd like to go crazy fast. If you're just a casual longboarder, then there are hundreds of different longboards meant for downhill.
uphill, for an experiment look for "Do forest fires move faster uphill or down hill
The answer to your question is in the questiong itself.
you bend down, don't turn, keep skis straight, and you do better the more weight you have
because if you going down hill its faster because its a mountain
Unless you have some additional force such as from a bike or car, you cannot get faster than terminal velocity.This is because of the extra forces acting to slow you down besides air pressure.
skateboarding with a longboard, not a trick board, and carving/bombing down hills
the chap with a spanner down his pants
When you play,press: up,down,down,up,up,down,down
i don't know if this is a trick question or not.up hill because a bear can't run downhill because it's front lega are shorter than the back ones so it would be more likely to roll downhill
well there is the downhill luge...
Downhill Creep