My favorite: Committing to the act. It's one of those things like drinking water where you know it'll have a great effect but the actual act is avoided like your creepy uncle lester.

Otherwise... I like to put my head in wierd positions, and then pretend my vision is like a tv and i'm sitting back in my head watching it theatre style. Like upside down on a detailed rug in the sunlight.

Imagination is very very fun, I can get tranced in to first-person adventures or kung-fu or giant wonderlands, w/e.

I like to attempt kundalini, it started happening on it's own when I woke up, but died down when I decided to stop taking everything so seriously.
It's fun, you can do things with your mind you never thought possible, levitating objects or creating psiballs and stuff. Lot of practice.

Most often, the simple act of increasing joy/euphoria/appreciation is enough for me, I do it until I break into laughter that I can't stop. Afterwards I always feel like I'm five years old again. It's not like theres a single way to do anything, there's so much creative power that as long as your comfortable anything is possible with enough relaxation/focus.

Anyone ever do Watsu?
It's where you trust someone enough to close your eyes and let them take over your body in a pool. They stretch it and swing you and it feels absolutely incredible after you consciously eliminate all tension within the body. I've only had it twice but it was awesome each time. Close to ego-death.