The previous posts were all good advice, especially about the GPS! One thing I've noticed is that not all running lights are created equal, especially the stern or "all around" white light.
Please make sure that yours is as bright as possible without spoiling your own night vision, since 1) the light does not move for someone that is overtaking you from directly astern, and 2) is therefore very easy for another boater to mistake for someody's front porch light!
Rinkerfam's statement about 360 degree awareness is also very important because of the above. Since your attention will be focussed mostly ahead, it is a good idea to have somebody else keeping a close watch astern (but you need to pay attention to what's behind you, too!)
Finally, I'd advise keeping your speed way, way down. The best GPS in the world will not show floating branches!
Have fun and be safe out there!
Silver Duck