The pilot had intended to enter the circuit for Runway 05 however when he arrived he found that the circuit for Runway 23 was active. One of his passengers asked to fly over a specific area which was located below a wide downwind position. A preceding aircraft was also making a full-stop landing and would require time to backtrack to clear the runway. As a result of these distractions, the pilot forgot the pre-landing checks and landed with the landing gear retracted. He said that he did not use a written checklist while operating the aircraft. The reason the automatic gear system did not operate was not determined. This accident was not the subject of a formal on scene investigation.