You could paint the poem on a wooden sandwich board, stake that down, and cover the tops of the stakes so no one cuts themselves. Folks could take digital photos. If anyone lingers and doesn't have a camera, then offer them a postcard. That way you don't have to have a huge amount, and they get to the right people.
There are also stages where you could read your poem at an open mic night. See the 2011 Art and Performance forum, then click on "Artists Seeking Stages".
Playa Info at Center Camp also has a stage.
Don't worry too much about gifting your first time out. Gift assistance to someone who needs it. Gift an extra hour of cleaning up MOOP (Matter Out of Place; trash, etc) out by the trash fence, or when you see something blowing down the street. Gift a beverage.
Don't worry. Wait and see how it's done. Accept gifts without feeling like you must reciprocate. (Reciprocation is trade or barter, not gifting.)