Please do not leave your piggies with no one to look after them. If you have a friend/neighbour/relative to see and feed them while you are away, please make sure they are going to tend to them at least once EVERYDAY. You cannot leave them unattended or unchecked for a day. Their food would need to be refilled everyday or if's either they will eat it all or the food will get spoiled.
We are going for a holiday overseas from next Saturday for 15 days and we made sure that my 3 piggies will be in a safe guinea pig boarding who knows how to handle and look after them (I do still worry a lot about them regardless though). I would never leave them to their own devices. They do get sick so easily and I would regret it if something bad happens to them because I didn't plan on their welfare while I'm away.