Which RPG do you enjoy adapting the most?
I have trouble playing anything straight (which is basically going to screw up my answer for #16 as well). When it comes to adapting games, I usually streamline things when I play them, forgetting a lot of rules unless they are really necessary to the specific situation being resolved...and even then I might just tweak the rules a bit to make things more story focused than mechanically focused.
I like the idea of using a central mechanism of play (which is why I liked the videos mentioned in my last post), and if I think one of the offshoot mechanisms of a game is just too unwieldy, I just shift everything back to that central concept.
I guess I enjoy adapting the various incarnations of D&D, because there is so much to adapt in them...so many mechanisms to strip out, so many fiddly bits to ignore. White Wolf's World of Darkness stuff is similar in this regard.
Other than that, I love adapting and modifying my own game systems. Running them a couple of times in a convention format with a few completely different groups of players, then tweaking them before going through the cycle again with a completely different group of players. The cycle iterates, and I never quite get it perfect, because my ideas of perfection continually evolve, but it's a fun journey.
So currently, I have the most enjoyment adapting The Law.