You actually don't even have to involve the Dragon at all, if you don't want to. (Personally, I'm taking some Silver Dragon Eggs on a tour of Amn. If they don't hatch, I'll assume that they're duds and take them back for a full refund.) Just go back in via the way you left, and viola. You'll still get the full EXP for clearing the Eastern Tunnels, etc., and you can do some pretty fun things: When Simyaz demands the Silver Sword Blade, you can whack him with the Silver Sword itself, etc.
