Here was the last Scion thread, so it might give you some ideas about the system. They're more opinions reguarding whether to use/not use the system than tips on running a game, though.

If you could give Xallace an idea of that boons are available, that would be great - it's been awhile since I read the book, and don't recall them off-hand.

Other than that, is sounds like you have a good handle on things. One point I liked about Scion was that it is similar enough to the other White Wolf systems that the two could interact if desired. If you have the other books, then throwing together some Vampires, Werewolves, or Changelings shouldn't be too difficult - especially as enemies. You may need to "translate" their powers into the Scion system a bit, though.

And, of course, the "boons" for the other systems can inspire new boons for your Scion game.