Most specifically, a plan. You almost certainly need to know what to expect when planning a trip to the Crater of Diamonds State Park. Study the weather report for the area and consider how you will handle the weather. Do you do well in the heat? How cold will it be? Will I want to wet sift in the cold, or do I need a light jacket to surface hunt in April? A little information goes a long way for a successful trip or full blown vacation. If you plan out the method for searching, you can take the weather into consideration and have a much more enjoyable visit and maybe, just maybe, find a Diamond!