Before you go out choose to be the designated driver for your friends. Go to a participating restaurant or venue with them. Declare to your server that you are the designated driver for the night and ask for a keychain card if you do not already have one. Display the card to your server and receive free soda all night. Drive your friends home safely and sober.
If you represent an establishment that would like to participate in this program it is quick and easy. Contact Ethan Tavan ( firstname.lastname@example.org ) and he will send you all the materials you need. Hang a few posters, get some keychain cards to give out, and throw a decal up on your window so people know you are participating and care about people's safety in your community. Once all that is set you will be good to go.