Be prepared!
Bring two forms of ID and a few bucks for food.
Make sure you're in shape and physically able to ride along - Notify of any medical conditions.
Wear neutral clothing and long pants. No flip-flops or weak shoes.
Do not bring any video cameras or other media for taking pictures, including cell phones.
Talk to your loved ones before making the decision to follow though with the ride along.
Do not wear offensive logo brand hats or clothing (includes police patches).
Bring a heavy-duty flashlight, like a Maglight or Surefire.
Demand some upper body armor.
Do not bring any firearms or weapons of any kind.
Don't get in the way or joke around too much.
Take care of any personal hygiene issues prior to showing up for the shift.
Be dedicated to the ride along and present a positive attitude.
Okay, I joke around a little, but you get the idea.
ETA: To find out more, click here:
www.google.com/search?hl=en&lr=&q=Police+ride+along+&btnG=SearchPick a few links and read the info. You won't get a bullet proof vest, but they all have pretty strict rules. Have fun.