Act as a seasoned travel guide with 10 years of experience in adventure tourism. Provide a detailed list of the top 5 global destinations for sandboarding, including [LOCATION], [BEST TIME TO VISIT], and [DIFFICULTY LEVEL] for each spot. For each destination, describe the unique features of the dunes, such as [HEIGHT], [TERRAIN TYPE], and [NEARBY ATTRACTIONS]. Also, include practical tips like [RECOMMENDED GEAR], [LOCAL GUIDES OR TOURS], and [SAFETY PRECAUTIONS]. Format the response as a traveler-friendly guide with bullet points for easy reading, and ensure the information is up-to-date and accurate.