Tail lights, maybe a flasher up front.

You might get sick.

Fenders, in my opinion, are pointless unless you live where there is a lot of road grime. It also doesn't rain enough here (Orange County) for me to have them. Clear or amber/yellow lenses in your sunglasses. Today will be safer where I live (Orange County) as the roads were washed off in yesterday's rain. A jacket would be good though to help keep torso warm.

Depending on the length of your block, you shouldn't get sick and you should be fine to go as you normally do.