You need to ingest foods which quickly convert into energy and have high energy sources such as fruit and energy bars. Make sure you take plenty of food along. Its always exciting to find new trails to ride. You obviously need to research the ride you are undertaking from all these considerations listed above. Once you have picked out what trail you what to do, you have to go through another level of investigation.
Detailed maps are vital.
What color trail sign does one follow, or which turn does one take at the intersection. Where does one park one s vehicle. Does it make a difference to go one direction vs the other in doing the trail. Very often you will find that it makes for a significantly better ride to do so. The bottom line is that you have to do your research on these trails.