If your internet access is reliable, no need to notify anyone. Read your traffic guidelines and school websites to figure out how long you have to respond to an offer. Will anyone be home to come up with a deposit?
Schools will most likely notify you of WL movement through email. Some schools deliver acceptances via a phone call, but if they are unable to reach you they will most certainly follow-up with an email notification. Have a wonderful trip but be sure to check your email!