Packing: In May, Sydney has mild autumn weather — pack layers, a light rain jacket, and comfortable walking shoes for harbor and coastal walks. Evenings can be cool, so include a sweater. Jet lag: To minimize jet lag on the long eastbound trip from Houston, shift sleep times gradually before departure, stay well-hydrated on board, and get sunlight exposure on arrival. Visas and documents: Confirm ETA or visitor visa requirements well in advance and ensure your passport meets validity recommendations. Health and biosecurity: Declare food, plant, and animal products at arrival to avoid fines, and double-check any health advisories before departure. CTA: Prepare travel documents and pack layered clothing for a comfortable May visit to Sydney from Houston.