Turn off the main valve into the house, anyways, it's cheap insurance.
If worse comes to worst, say there's an ice storm and half the state loses power for a week, it'll limit the damage to just the water that's in the pipes, not a continuous supply of water all week...
If you want to drain every pipe in the house & antifreeze all the traps, that's a whole other story, and probably not worth the hassle for 10 days.
I'd leave the heat at 55, it's what I do with the house I caretake, because that's what everybody does around here, and it's what we used to do back home (Canada), and it's what most folk did in Vermont when i lived there. Never had a problem.
Also - turn off your water heater. No reason to keep a supply of hot water when nobody's there to use it. And if ever there was a leak from burst pipes freezing, it might save the heater.