The hardest thing to not overpack is your wardrobe. If you can manage to wear the same pants the entire trip, you don't need an extra pair. (They take up space.) Likewise with socks, underwear, shirts, etc. Finding room for an extra pair of shoes is a premium, though. Something to allow you to kick off your boots a while and still not be grounded.
Tools? I carry a pretty good selection, and I can't recall ever needing anything. I had to adjust my mirrors last May after leaving Chy's house in Dahlonega, and was glad I had the right sized wrench for that, but with hindsite, a small adjustable wrench would have sufficed while I carry a full set of combos...
700 miles? How much Interstate? I know the terrain might be a lot different, but if you can travel highway speeds the majority of the way, that's a one-day trip easy. I like to start my long trips about mid-day, or early afternoon (when I have the time to spare), and then ride through the night. That might be a bad call though if the scenery is of any significance.
Do a good pre-trip inspection and assure proper tire inflation/condition.
Pack lite, and have fun!
The most important factor, really, is being properly attired to be comfortable on the road. You have to stay warm. It's easier to take things off than to put them on, and as long as you're moving, most things won't feel like they need to come off.
Road Trip!
