I bought a pond yacht , about 14 inches long .I intend to strengthen the mast and fully coat everything in a polyurethane . Sails out of Spinnaker cloth . On the deck is mounted a 4 inch x 1/2 inch waterproof tube . I intend to release this vessel from Broome , Australia , when the easterlies start . Question is , what do I write on the note that I will put in the waterproof tube ? Apart from my contact details of course ! What gift or prize inside ?  I invite submissions please .