Do when you study English?
Get connected to your home, and your hometown, your country (I suppose Japan), by e-mail and sites described in the Japanese language.
Recently, it is easy to acquire such environments by smart phones and WI-FI connections.
Simply staying busy will enable you to keep your mind active so that it does not preoccupy itself with thoughts of home.
Fully enjoy your trip. Good luck!!
You should bring your iPhone with you so that you could stay in touch with your friends and your loved ones.
If you don't have one, go get your iPhone today!
You can Facebook, Twitter, Skype and text with your iPhone anywhere in the States at anytime.
I always bring my iPhone on my trip to the States. You can share your photo and your video with your friends.