Enjoy your new job!!!! I hope it is a really positive experience for you. How...err, exciting, to start during a JACHO review.
These tips are not for you to implement in the next 4 weeks, as you are going to be BUSY
One tip is to really keep up with the continuing education offerred at the hospital, and join your local nursing association. In general the CE's are free and can lead you to different opportunities if you decide you want them, so take advantage of classes. Even if you won't be using those skills immediately, it can't hurt to learn. If you decide you love Med-Surg, go for the certifications offerred in that speciality.
In your local nursing organization you can learn a lot, meet others outside of your hospital and have a pretty good time. (I joined my local ENA (Emergency Nurses Association) right out of school, and the contacts and friends I made were excellent.
Otherwise of course ask tons of questions, be supportive of the CNAs and ward clerks (and they will in turn be supportive of you.), and enjoy your new career.