Teleportation, the ability to travel at any speed desired + levitation / flight, infinite life, invulnerability, omnipotence, and maybe near-omniscience... Those would be the ones I'd like.
Teleportation speaks for itself. Living a life without the restriction of distance has countless advantages. The ability to travel at any speed + levitation / flight would just be for fun. I know infinite life has a bad rap, but it's honestly something I'd love to have. It would have to come with invulnerability, though, so that eternal life would be free of physical pain, allowing one to do anything and go anywhere without consequence. (It'd be no good to have humanity hunt you down and leave you immortal but all messed up!) Omnipotence would be for protecting others / doing the things I'd like to do. Near-omniscience would be nice, though the "near-" is just tacked on so an immortal life wouldn't be too boring. At the very least I would like to know everything everyone has ever done, or ever will do.
I'd love to have these and go around blowing all of the world's darkest secrets to the public. To bring the hateful world leaders to the light, to rid the world of any weaponry that could harm others... To force humanity into a state of weaponless near-peace... The useless squabbles over land, the pointless fighting of countries... To bring all of that to an end and let people focus on what really matters in life. Of course I'd also use it to help others get the goods (food, water, etc.) they need. It's things like this that would make the choice for immortality worth it in the end.