More questions:
Can I just show up and get the checkpoints but not compete?
No, taking the checkpoints is still considered participating. I cannot prevent you from showing up at Byrd's adventure center and exploring the National Forest, but if I have more than 60 people participate in this event I am likely to be fined a large sum of money.
Is a snorkel mandatory?
No, the main set of check points will be accessible by multiple routes. If the water level is high and crossings unsafe, we will remove that checkpoint. I recommend you be cautious. I have seen these crossings become unpredictable in minutes. If the majority of the group cannot make a specific checkpoint and it is well voiced, I will remove that checkpoint from the Rally.