Do nothing- haven't ever had a leak, why would it start while I am gone in Atlanta during summer?
Just turn off fridge icemaker and toilet valves- easy to turn back on again with no stress to plumbing...
Turn off main water to house and completely turn off hot water heater and shut off the gas(there are lines in the house that might below the lowest point of the HW heater)
Not sure if a complete water system shutdown would be good for pipes in a 30YO home, or necessary. Googling I get varied responses from "totally not necessary, and possibly bad" to "manditory".
What say my trusted friends here on BT3K Central?