Yessir, the best day of fishing can quickly become the worst if there is a safety issue. For a yakker the following are mandatory before shoving off...
Type III PFD ~ it can't save your life if you're not wearing it.
Airhorn/noisemaker ~ yak's are very low profile and power boaters are not always aware.
Cell phone/radio ~ keep on hand in a water/weather proof case or ziplock on your person.
First aid kit ~ learn to do the mono trick for hook removal.
Float plan ~ info for at least 2 people about exactly where you are going and when you'll be back.
Head and eye protection ~ flying hooks are no joke, neither is sun stroke.
Hydration ~ paddling is a physical activity. Drink lots of water.
Common sense ~ anyone without it on the water is just asking for a come to Jesus meeting.