Choose your route carefully if you can. Google maps has data on bike lanes and bike-friendly streets. Use the aerial photos to look at the lane configuration. Stay off of arterial roads if possible, use side streets when they are practical.
Use puncture resistant tires if possible (my understanding is that Schwalbe Marathon Plus is the gold standard here). Bring a pump, tire levers, spare tube, patch kit.
Get a bright flashing light for both front and back that is visible in the daytime.
Assume every driver is a sleep-deprived, murderous sociopath who is drinking coffee with one hand while trying to text with the other and driving with their knees.