In general, we recommend hiring trained guides for most expeditions. This practice contributes to the local economy by providing employment, opening up opportunities for language and cultural exchange, and helping promote eco-friendly practices. This last point is especially important because one of the most critical factors in marine conservation is controlling human impact on fragile reef systems. Plus, guides are usually in the water several times a day, every day of the year, so they know exactly where and how to find the most active underwater ecosystems!