(Sorry I just saw this!)
I have a few reasons,
Primarily, my SO will be in Hawaii and the location works well for the two of us.
Secondly, UH is in a prime geographic position for me - what with Pacific Strategy being my focus of study. I'm excited about the post grad employment opportunities there and building up a network near PACOM.
Money was also a big player, I got nothing from Gtown, even after attempted negotiation.
I think another big thing was that I'm comfortable in the Big Fish, Small Pond dynamic. My undergrad was like this, and I thrived.
Let me know if you have any other questions!