I recommend a full faced DOT approved motorcycle helmet. Yes, they don't look as cool as a 1/2 helmet, but I value keeping my teeth in the event of a face plant far more than looking cool.
Another excellent safety item that I recommend is a bright-as-all-get-out strobe light. Use it during daylight hours! It really helps get the attention of the spaced out soccer moms fighting the kiddies in the back seat while balancing a Starbucks coffee in their lap all while holding a cel phone up to their head.
Like this one:Here
For night riding I recommend getting the Magic Shine lens advertised on the bottom. They are easy to install and really spread out the light pattern to a wide beam rather than the factory spot beam.