The loop: runnable, gentle, deceptively easy early
The footing here is kind. These are flowy mountain-bike trails, so the grades are gradual and there is almost no technical rock or root to slow you down. That is exactly the trap. On the first couple of laps the loop feels so easy you will want to run all of it, including the gentle rises you should be power-hiking. Bank that effort instead of those minutes. The runner who jogs the early climbs at a conversational effort and walks the eating has way more left at lap five than the one who raced the first marathon because it felt good.
Learn the loop on lap one. Notice where the aid sits, where the shade is, where the road sections are, where you can zone out and where you need to pay attention. You are going to see this same ground seven more times, so the more you turn it into a familiar routine, the less it grinds on you later.