I'll shriek like a little girl and run as fast as I possibly can in the opposite direction, using any nearby innocents as living shields against the dragon's rage.
I know! 1 Hide under a rock (or behind whatever suits you better lol) 2 Send pathetic undead minions to make the dragon laugh himself to death! 3 absorb soul
First Id roll around the fire breath, trying to use the terrain to my advantage (hiding behind rocks and things)
As the beast clumsily tries to pivot on its 2 legs and Flight limbs whilst on the ground, I will run behind it.
Upon grabbing its tail i will begin to spin, whirling the beast around like a hammer throw.
Likewise I would try to duke its fire breath, charge to its head and crush its skull with my mighty hammer and begin to crush its head more and more until I knew it was dead.
I would then flip the beast onto its back, pull out my sword and tear into its chest. Ripping out its heart and then continuing to consume the still beating hunk of meat, gaining its power.
With a dead cow filled with poison apples. If that doesn't work then I use an adoring fan as a bait. I'll jump on the dragon's head and hack the eyes and head.
Oh, right, forgot I was Dragonborn. I'd probably run in slow-motion, in a really epic, stoic kind of way, flashing my rock hard abs at any lusty Argonian maids nearby. Shortly before being eaten.
Like in new vegas just EYEBALL the dragon! He will drop to the ground and then say to you : ARE YOU EYEBALLING ME?! and then kill it with a epic shout!