Prepare for your scuba diving trip by first checking the weather and diving conditions. Gather necessary identification, certifications, and travel documents, along with your scuba diving equipment and accessories. Make sure to inspect and clean your gear, and pack essentials like a mesh bag, defog solution, and personal care items. Don't forget appropriate clothing, snacks, and water for the boat, as well as charging your electronic devices. Lastly, ensure you have a small first aid kit and confirm all reservations and transportation arrangements for a smooth and enjoyable diving experience.