Have fun on your trip! It sounds like it'll be pretty cool.

As for your snake, when i'm away I always boost the thermostat (in the house) up so it's nice and toasty for them. (but I have to rely on a space heater to keep my temps up) Make sure everyone has a nice, big, fresh bowl of water and everyone is in they're cage. As long as you have a thermostat controling temps you should be good, but I always stress anyway.