I love the sensation of speed... So any ride really, but think that's why I enjoy Rita a lot as it keeps the speed well.
Helixes/tight corners, Nemesis after the first inversion, and Nemesis Inferno right at the end - these 2 are my top 2 rides in the UK! Swarm deserves a mention as well as I started to grey out on it!
Airtime, which unfortunately my favourite 2 don't really have any of... Stealth is amazing for air time, I also love 13 on the back row, as well as the airtime hill on Saw & Speed (Colossus's is okay, as well as the Smiler but doesn't really eject you from your seat), Rita and most wooden coasters that I've been on are pretty decent.
Sudden changes of direction to near misses... The two for me are Nemesis just into the 2nd inversion, and on Air (even though I don't like the ride much as it's uncomfortable) I love the section where you're on your back and go back round to on your front just as you go through the tunnel which is always a great feeling especially on the outsides when you think you're so close.